Fix b0e73277: cargodist information got lost when splitting of cargo (#11280)

During b0e73277 we removed loaded_at_xy, but I kinda forgot that
it was a union with next_station. Now next_station wasn't copied
anymore, or checked in AreMergable.

src/CMakeLists.txt

@@ -117,7 +117,6 @@ add_files(
     currency.h
     date_gui.cpp
     date_gui.h
-    date_type.h
     debug.cpp
     debug.h
     dedicated.cpp

src/aircraft_cmd.cpp

@@ -453,7 +453,7 @@ void Aircraft::OnNewDay()
 
 	if (this->running_ticks == 0) return;
 
-	CommandCost cost(EXPENSES_AIRCRAFT_RUN, this->GetRunningCost() * this->running_ticks / (DAYS_IN_YEAR * DAY_TICKS));
+	CommandCost cost(EXPENSES_AIRCRAFT_RUN, this->GetRunningCost() * this->running_ticks / (CalendarTime::DAYS_IN_YEAR * Ticks::DAY_TICKS));
 
 	this->profit_this_year -= cost.GetCost();
 	this->running_ticks = 0;

src/build_vehicle_gui.cpp

@@ -967,7 +967,7 @@ int DrawVehiclePurchaseInfo(int left, int right, int y, EngineID engine_number,
 	if (e->type != VEH_TRAIN || e->u.rail.railveh_type != RAILVEH_WAGON) {
 		/* Design date - Life length */
 		SetDParam(0, ymd.year);
-		SetDParam(1, DateToYear(e->GetLifeLengthInDays()));
+		SetDParam(1, TimerGameCalendar::DateToYear(e->GetLifeLengthInDays()));
 		DrawString(left, right, y, STR_PURCHASE_INFO_DESIGNED_LIFE);
 		y += FONT_HEIGHT_NORMAL;
 

src/cargopacket.cpp

@@ -57,6 +57,7 @@ CargoPacket::CargoPacket(StationID first_station, TileIndex source_xy, uint16_t
  * @param count              Number of cargo entities to put in this packet.
  * @param periods_in_transit Number of cargo aging periods the cargo has been in transit.
  * @param first_station      Station the cargo was initially loaded.
+ * @param next_station       Next station the cargo wants to go.
  * @param source_xy          Station location the cargo was initially loaded.
  * @param feeder_share       Feeder share the packet has already accumulated.
  * @param source_type        'Type' of source the packet comes from (for subsidies).
@@ -64,14 +65,15 @@ CargoPacket::CargoPacket(StationID first_station, TileIndex source_xy, uint16_t
  * @note We have to zero memory ourselves here because we are using a 'new'
  * that, in contrary to all other pools, does not memset to 0.
  */
-CargoPacket::CargoPacket(uint16_t count, uint16_t periods_in_transit, StationID first_station, TileIndex source_xy, Money feeder_share, SourceType source_type, SourceID source_id) :
+CargoPacket::CargoPacket(uint16_t count, uint16_t periods_in_transit, StationID first_station, StationID next_station, TileIndex source_xy, Money feeder_share, SourceType source_type, SourceID source_id) :
 		count(count),
 		periods_in_transit(periods_in_transit),
 		feeder_share(feeder_share),
 		source_xy(source_xy),
 		source_id(source_id),
 		source_type(source_type),
-		first_station(first_station)
+		first_station(first_station),
+		next_station(next_station)
 {
 	assert(count != 0);
 }
@@ -86,7 +88,7 @@ CargoPacket *CargoPacket::Split(uint new_size)
 	if (!CargoPacket::CanAllocateItem()) return nullptr;
 
 	Money fs = this->GetFeederShare(new_size);
-	CargoPacket *cp_new = new CargoPacket(new_size, this->periods_in_transit, this->first_station, this->source_xy,  fs, this->source_type, this->source_id);
+	CargoPacket *cp_new = new CargoPacket(new_size, this->periods_in_transit, this->first_station, this->next_station, this->source_xy, fs, this->source_type, this->source_id);
 	this->feeder_share -= fs;
 	this->count -= new_size;
 	return cp_new;

src/cargopacket.h

@@ -63,7 +63,7 @@ public:
 
 	CargoPacket();
 	CargoPacket(StationID first_station, TileIndex source_xy, uint16_t count, SourceType source_type, SourceID source_id);
-	CargoPacket(uint16_t count, uint16_t periods_in_transit, StationID source, TileIndex source_xy, Money feeder_share = 0, SourceType source_type = SourceType::Industry, SourceID source_id = INVALID_SOURCE);
+	CargoPacket(uint16_t count, uint16_t periods_in_transit, StationID first_station, StationID next_station, TileIndex source_xy, Money feeder_share = 0, SourceType source_type = SourceType::Industry, SourceID source_id = INVALID_SOURCE);
 
 	/** Destroy the packet. */
 	~CargoPacket() { }
@@ -422,6 +422,7 @@ public:
 		return cp1->source_xy == cp2->source_xy &&
 				cp1->periods_in_transit == cp2->periods_in_transit &&
 				cp1->source_type == cp2->source_type &&
+				cp1->next_station == cp2->next_station &&
 				cp1->source_id == cp2->source_id;
 	}
 };
@@ -536,6 +537,7 @@ public:
 		return cp1->source_xy == cp2->source_xy &&
 				cp1->periods_in_transit == cp2->periods_in_transit &&
 				cp1->source_type == cp2->source_type &&
+				cp1->next_station == cp2->next_station &&
 				cp1->source_id == cp2->source_id;
 	}
 };

src/cheat_gui.cpp

@@ -104,7 +104,7 @@ extern void EnginesMonthlyLoop();
 static int32_t ClickChangeDateCheat(int32_t new_value, int32_t change_direction)
 {
 	/* Don't allow changing to an invalid year, or the current year. */
-	auto new_year = Clamp(TimerGameCalendar::Year(new_value), MIN_YEAR, MAX_YEAR);
+	auto new_year = Clamp(TimerGameCalendar::Year(new_value), CalendarTime::MIN_YEAR, CalendarTime::MAX_YEAR);
 	if (new_year == TimerGameCalendar::year) return static_cast<int32_t>(TimerGameCalendar::year);
 
 	TimerGameCalendar::YearMonthDay ymd;
@@ -320,7 +320,7 @@ struct CheatWindow : Window {
 					switch (ce->str) {
 						/* Display date for change date cheat */
 						case STR_CHEAT_CHANGE_DATE:
-							SetDParam(0, TimerGameCalendar::ConvertYMDToDate(MAX_YEAR, 11, 31));
+							SetDParam(0, TimerGameCalendar::ConvertYMDToDate(CalendarTime::MAX_YEAR, 11, 31));
 							width = std::max(width, GetStringBoundingBox(ce->str).width);
 							break;
 

src/company_cmd.cpp

@@ -659,7 +659,7 @@ static void HandleBankruptcyTakeover(Company *c)
 	 * number of companies. The minimum number of days in a quarter
 	 * is 90: 31 in January, 28 in February and 31 in March.
 	 * Note that the company going bankrupt can't buy itself. */
-	static const int TAKE_OVER_TIMEOUT = 3 * 30 * DAY_TICKS / (MAX_COMPANIES - 1);
+	static const int TAKE_OVER_TIMEOUT = 3 * 30 * Ticks::DAY_TICKS / (MAX_COMPANIES - 1);
 
 	assert(c->bankrupt_asked != 0);
 
@@ -717,7 +717,7 @@ void OnTick_Companies()
 	}
 
 	if (_new_competitor_timeout.HasFired() && _game_mode != GM_MENU && AI::CanStartNew()) {
-		int32_t timeout = _settings_game.difficulty.competitors_interval * 60 * TICKS_PER_SECOND;
+		int32_t timeout = _settings_game.difficulty.competitors_interval * 60 * Ticks::TICKS_PER_SECOND;
 		/* If the interval is zero, start as many competitors as needed then check every ~10 minutes if a company went bankrupt and needs replacing. */
 		if (timeout == 0) {
 			/* count number of competitors */
@@ -731,7 +731,7 @@ void OnTick_Companies()
 				if (n++ >= _settings_game.difficulty.max_no_competitors) break;
 				Command<CMD_COMPANY_CTRL>::Post(CCA_NEW_AI, INVALID_COMPANY, CRR_NONE, INVALID_CLIENT_ID);
 			}
-			timeout = 10 * 60 * TICKS_PER_SECOND;
+			timeout = 10 * 60 * Ticks::TICKS_PER_SECOND;
 		}
 		/* Randomize a bit when the AI is actually going to start; ranges from 87.5% .. 112.5% of indicated value. */
 		timeout += ScriptObject::GetRandomizer(OWNER_NONE).Next(timeout / 4) - timeout / 8;

src/company_gui.cpp

@@ -1861,7 +1861,7 @@ struct CompanyInfrastructureWindow : Window
 		}
 
 		/* Get the date introduced railtypes as well. */
-		this->railtypes = AddDateIntroducedRailTypes(this->railtypes, MAX_DATE);
+		this->railtypes = AddDateIntroducedRailTypes(this->railtypes, CalendarTime::MAX_DATE);
 
 		/* Find the used roadtypes. */
 		for (const Engine *e : Engine::IterateType(VEH_ROAD)) {
@@ -1871,7 +1871,7 @@ struct CompanyInfrastructureWindow : Window
 		}
 
 		/* Get the date introduced roadtypes as well. */
-		this->roadtypes = AddDateIntroducedRoadTypes(this->roadtypes, MAX_DATE);
+		this->roadtypes = AddDateIntroducedRoadTypes(this->roadtypes, CalendarTime::MAX_DATE);
 		this->roadtypes &= ~_roadtypes_hidden_mask;
 	}
 

src/date_gui.cpp

@@ -13,7 +13,6 @@
 #include "window_func.h"
 #include "window_gui.h"
 #include "date_gui.h"
-#include "date_type.h"
 #include "core/geometry_func.hpp"
 
 #include "widgets/dropdown_type.h"
@@ -44,8 +43,8 @@ struct SetDateWindow : Window {
 			Window(desc),
 			callback(callback),
 			callback_data(callback_data),
-			min_year(std::max(MIN_YEAR, min_year)),
+			min_year(std::max(CalendarTime::MIN_YEAR, min_year)),
-			max_year(std::min(MAX_YEAR, max_year))
+			max_year(std::min(CalendarTime::MAX_YEAR, max_year))
 	{
 		assert(this->min_year <= this->max_year);
 		this->parent = parent;

src/date_type.h

@@ -1,103 +0,0 @@
-/*
- * This file is part of OpenTTD.
- * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
- * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/** @file date_type.h Types related to the dates in OpenTTD. */
-
-#ifndef DATE_TYPE_H
-#define DATE_TYPE_H
-
-#include "timer/timer_game_calendar.h"
-
-typedef int32_t  Ticks;     ///< The type to store ticks in
-
-
-/**
- * 1 day is 74 ticks; TimerGameCalendar::date_fract used to be uint16_t and incremented by 885. On
- *                    an overflow the new day begun and 65535 / 885 = 74.
- * 1 tick is approximately 27 ms.
- * 1 day is thus about 2 seconds (74 * 27 = 1998) on a machine that can run OpenTTD normally
- */
-static const int DAY_TICKS         =  74; ///< ticks per day
-static const int DAYS_IN_YEAR      = 365; ///< days per year
-static const int DAYS_IN_LEAP_YEAR = 366; ///< sometimes, you need one day more...
-static const int MONTHS_IN_YEAR    =  12; ///< months per year
-
-static const int SECONDS_PER_DAY   = 2;   ///< approximate seconds per day, not for precise calculations
-
-static const int STATION_RATING_TICKS     = 185; ///< cycle duration for updating station rating
-static const int STATION_ACCEPTANCE_TICKS = 250; ///< cycle duration for updating station acceptance
-static const int STATION_LINKGRAPH_TICKS  = 504; ///< cycle duration for cleaning dead links
-static const int CARGO_AGING_TICKS        = 185; ///< cycle duration for aging cargo
-static const int INDUSTRY_PRODUCE_TICKS   = 256; ///< cycle duration for industry production
-static const int TOWN_GROWTH_TICKS        = 70;  ///< cycle duration for towns trying to grow. (this originates from the size of the town array in TTD
-static const int INDUSTRY_CUT_TREE_TICKS  = INDUSTRY_PRODUCE_TICKS * 2; ///< cycle duration for lumber mill's extra action
-
-
-/*
- * ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR and DAYS_TILL_ORIGINAL_BASE_YEAR are
- * primarily used for loading newgrf and savegame data and returning some
- * newgrf (callback) functions that were in the original (TTD) inherited
- * format, where 'TimerGameCalendar::date == 0' meant that it was 1920-01-01.
- */
-
-/** The minimum starting year/base year of the original TTD */
-static constexpr TimerGameCalendar::Year ORIGINAL_BASE_YEAR = 1920;
-/** The original ending year */
-static constexpr TimerGameCalendar::Year ORIGINAL_END_YEAR = 2051;
-/** The maximum year of the original TTD */
-static constexpr TimerGameCalendar::Year ORIGINAL_MAX_YEAR = 2090;
-
-/**
- * Calculate the date of the first day of a given year.
- * @param year the year to get the first day of.
- * @return the date.
- */
-static constexpr TimerGameCalendar::Date DateAtStartOfYear(TimerGameCalendar::Year year)
-{
-	int32_t year_as_int = static_cast<int32_t>(year);
-	uint number_of_leap_years = (year == 0) ? 0 : ((year_as_int - 1) / 4 - (year_as_int - 1) / 100 + (year_as_int - 1) / 400 + 1);
-
-	return (DAYS_IN_YEAR * year_as_int) + number_of_leap_years;
-}
-
-/**
- * Calculate the year of a given date.
- * @param date The date to consider.
- * @return the year.
- */
-static inline TimerGameCalendar::Year DateToYear(TimerGameCalendar::Date date)
-{
-	return static_cast<int32_t>(date) / DAYS_IN_LEAP_YEAR;
-}
-
-/**
- * The date of the first day of the original base year.
- */
-static constexpr TimerGameCalendar::Date DAYS_TILL_ORIGINAL_BASE_YEAR = DateAtStartOfYear(ORIGINAL_BASE_YEAR);
-
-/** The absolute minimum & maximum years in OTTD */
-static constexpr TimerGameCalendar::Year MIN_YEAR = 0;
-
-/** The default starting year */
-static constexpr TimerGameCalendar::Year DEF_START_YEAR = 1950;
-/** The default scoring end year */
-static constexpr TimerGameCalendar::Year DEF_END_YEAR = ORIGINAL_END_YEAR - 1;
-
-/**
- * MAX_YEAR, nicely rounded value of the number of years that can
- * be encoded in a single 32 bits date, about 2^31 / 366 years.
- */
-static constexpr TimerGameCalendar::Year MAX_YEAR = 5000000;
-
-/** The date of the last day of the max year. */
-static constexpr TimerGameCalendar::Date MAX_DATE = DateAtStartOfYear(MAX_YEAR + 1) - 1;
-
-static constexpr TimerGameCalendar::Year INVALID_YEAR = -1; ///< Representation of an invalid year
-static constexpr TimerGameCalendar::Date INVALID_DATE = -1; ///< Representation of an invalid date
-static constexpr Ticks INVALID_TICKS = -1; ///< Representation of an invalid number of ticks
-
-#endif /* DATE_TYPE_H */

src/depot_gui.cpp

@@ -360,7 +360,7 @@ struct DepotWindow : Window {
 			DrawSpriteIgnorePadding((v->vehstatus & VS_STOPPED) ? SPR_FLAG_VEH_STOPPED : SPR_FLAG_VEH_RUNNING, PAL_NONE, flag, false, SA_CENTER);
 
 			SetDParam(0, v->unitnumber);
-			DrawString(text, STR_JUST_COMMA, (v->max_age - DAYS_IN_LEAP_YEAR) >= v->age ? TC_BLACK : TC_RED);
+			DrawString(text, STR_JUST_COMMA, (v->max_age - CalendarTime::DAYS_IN_LEAP_YEAR) >= v->age ? TC_BLACK : TC_RED);
 		}
 	}
 

src/economy.cpp

@@ -735,7 +735,7 @@ bool AddInflation(bool check_year)
 	 * inflation doesn't add anything after that either; it even makes playing
 	 * it impossible due to the diverging cost and income rates.
 	 */
-	if (check_year && (TimerGameCalendar::year < ORIGINAL_BASE_YEAR || TimerGameCalendar::year >= ORIGINAL_MAX_YEAR)) return true;
+	if (check_year && (TimerGameCalendar::year < CalendarTime::ORIGINAL_BASE_YEAR || TimerGameCalendar::year >= CalendarTime::ORIGINAL_MAX_YEAR)) return true;
 
 	if (_economy.inflation_prices == MAX_INFLATION || _economy.inflation_payment == MAX_INFLATION) return true;
 
@@ -928,7 +928,7 @@ void StartupEconomy()
 
 	if (_settings_game.economy.inflation) {
 		/* Apply inflation that happened before our game start year. */
-		int months = static_cast<int32_t>(std::min(TimerGameCalendar::year, ORIGINAL_MAX_YEAR) - ORIGINAL_BASE_YEAR) * 12;
+		int months = static_cast<int32_t>(std::min(TimerGameCalendar::year, CalendarTime::ORIGINAL_MAX_YEAR) - CalendarTime::ORIGINAL_BASE_YEAR) * 12;
 		for (int i = 0; i < months; i++) {
 			AddInflation(false);
 		}

src/engine.cpp

@@ -30,6 +30,7 @@
 #include "error.h"
 #include "engine_base.h"
 #include "timer/timer.h"
+#include "timer/timer_game_tick.h"
 #include "timer/timer_game_calendar.h"
 
 #include "table/strings.h"
@@ -94,7 +95,7 @@ Engine::Engine(VehicleType type, EngineID base)
 			default: break; // The aircraft, disasters and especially visual effects have no NewGRF configured visual effects
 		}
 		/* Set cargo aging period to the default value. */
-		this->info.cargo_age_period = CARGO_AGING_TICKS;
+		this->info.cargo_age_period = Ticks::CARGO_AGING_TICKS;
 		/* Not a variant */
 		this->info.variant_id = INVALID_ENGINE;
 		return;
@@ -437,7 +438,7 @@ uint Engine::GetDisplayMaxTractiveEffort() const
  */
 TimerGameCalendar::Date Engine::GetLifeLengthInDays() const
 {
-	return DateAtStartOfYear(this->info.lifelength + _settings_game.vehicle.extend_vehicle_life);
+	return TimerGameCalendar::DateAtStartOfYear(this->info.lifelength + _settings_game.vehicle.extend_vehicle_life);
 }
 
 /**
@@ -662,7 +663,7 @@ void SetYearEngineAgingStops()
 
 		/* Base year ending date on half the model life */
 		TimerGameCalendar::YearMonthDay ymd;
-		TimerGameCalendar::ConvertDateToYMD(ei->base_intro + static_cast<int32_t>(DateAtStartOfYear(ei->lifelength)) / 2, &ymd);
+		TimerGameCalendar::ConvertDateToYMD(ei->base_intro + static_cast<int32_t>(TimerGameCalendar::DateAtStartOfYear(ei->lifelength)) / 2, &ymd);
 
 		_year_engine_aging_stops = std::max(_year_engine_aging_stops, ymd.year);
 	}
@@ -1102,7 +1103,7 @@ void EnginesMonthlyLoop()
 			/* Do not introduce invalid engines */
 			if (!e->IsEnabled()) continue;
 
-			if (!(e->flags & ENGINE_AVAILABLE) && TimerGameCalendar::date >= (e->intro_date + DAYS_IN_YEAR)) {
+			if (!(e->flags & ENGINE_AVAILABLE) && TimerGameCalendar::date >= (e->intro_date + CalendarTime::DAYS_IN_YEAR)) {
 				/* Introduce it to all companies */
 				NewVehicleAvailable(e);
 			} else if (!(e->flags & (ENGINE_AVAILABLE | ENGINE_EXCLUSIVE_PREVIEW)) && TimerGameCalendar::date >= e->intro_date) {

src/genworld_gui.cpp

@@ -569,8 +569,8 @@ struct GenerateLandscapeWindow : public Window {
 			this->SetWidgetDisabledState(WID_GL_HEIGHTMAP_HEIGHT_DOWN, _settings_newgame.game_creation.heightmap_height <= MIN_HEIGHTMAP_HEIGHT);
 			this->SetWidgetDisabledState(WID_GL_HEIGHTMAP_HEIGHT_UP, _settings_newgame.game_creation.heightmap_height >= GetMapHeightLimit());
 		}
-		this->SetWidgetDisabledState(WID_GL_START_DATE_DOWN, _settings_newgame.game_creation.starting_year <= MIN_YEAR);
+		this->SetWidgetDisabledState(WID_GL_START_DATE_DOWN, _settings_newgame.game_creation.starting_year <= CalendarTime::MIN_YEAR);
-		this->SetWidgetDisabledState(WID_GL_START_DATE_UP,   _settings_newgame.game_creation.starting_year >= MAX_YEAR);
+		this->SetWidgetDisabledState(WID_GL_START_DATE_UP,   _settings_newgame.game_creation.starting_year >= CalendarTime::MAX_YEAR);
 		this->SetWidgetDisabledState(WID_GL_SNOW_COVERAGE_DOWN, _settings_newgame.game_creation.snow_coverage <= 0 || _settings_newgame.game_creation.landscape != LT_ARCTIC);
 		this->SetWidgetDisabledState(WID_GL_SNOW_COVERAGE_UP,   _settings_newgame.game_creation.snow_coverage >= 100 || _settings_newgame.game_creation.landscape != LT_ARCTIC);
 		this->SetWidgetDisabledState(WID_GL_DESERT_COVERAGE_DOWN, _settings_newgame.game_creation.desert_coverage <= 0 || _settings_newgame.game_creation.landscape != LT_TROPIC);
@@ -599,7 +599,7 @@ struct GenerateLandscapeWindow : public Window {
 				break;
 
 			case WID_GL_START_DATE_TEXT:
-				SetDParam(0, TimerGameCalendar::ConvertYMDToDate(MAX_YEAR, 0, 1));
+				SetDParam(0, TimerGameCalendar::ConvertYMDToDate(CalendarTime::MAX_YEAR, 0, 1));
 				d = GetStringBoundingBox(STR_JUST_DATE_LONG);
 				break;
 
@@ -763,7 +763,7 @@ struct GenerateLandscapeWindow : public Window {
 				if (!(this->flags & WF_TIMEOUT) || this->timeout_timer <= 1) {
 					this->HandleButtonClick(widget);
 
-					_settings_newgame.game_creation.starting_year = Clamp(_settings_newgame.game_creation.starting_year + widget - WID_GL_START_DATE_TEXT, MIN_YEAR, MAX_YEAR);
+					_settings_newgame.game_creation.starting_year = Clamp(_settings_newgame.game_creation.starting_year + widget - WID_GL_START_DATE_TEXT, CalendarTime::MIN_YEAR, CalendarTime::MAX_YEAR);
 					this->InvalidateData();
 				}
 				_left_button_clicked = false;
@@ -968,7 +968,7 @@ struct GenerateLandscapeWindow : public Window {
 			/* An empty string means revert to the default */
 			switch (this->widget_id) {
 				case WID_GL_HEIGHTMAP_HEIGHT_TEXT: value = MAP_HEIGHT_LIMIT_AUTO_MINIMUM; break;
-				case WID_GL_START_DATE_TEXT: value = static_cast<int32_t>(DEF_START_YEAR); break;
+				case WID_GL_START_DATE_TEXT: value = static_cast<int32_t>(CalendarTime::DEF_START_YEAR); break;
 				case WID_GL_SNOW_COVERAGE_TEXT: value = DEF_SNOW_COVERAGE; break;
 				case WID_GL_DESERT_COVERAGE_TEXT: value = DEF_DESERT_COVERAGE; break;
 				case WID_GL_TOWN_PULLDOWN: value = 1; break;
@@ -987,7 +987,7 @@ struct GenerateLandscapeWindow : public Window {
 
 			case WID_GL_START_DATE_TEXT:
 				this->SetWidgetDirty(WID_GL_START_DATE_TEXT);
-				_settings_newgame.game_creation.starting_year = Clamp(TimerGameCalendar::Year(value), MIN_YEAR, MAX_YEAR);
+				_settings_newgame.game_creation.starting_year = Clamp(TimerGameCalendar::Year(value), CalendarTime::MIN_YEAR, CalendarTime::MAX_YEAR);
 				break;
 
 			case WID_GL_SNOW_COVERAGE_TEXT:
@@ -1125,8 +1125,8 @@ struct CreateScenarioWindow : public Window
 
 	void OnPaint() override
 	{
-		this->SetWidgetDisabledState(WID_CS_START_DATE_DOWN,       _settings_newgame.game_creation.starting_year <= MIN_YEAR);
+		this->SetWidgetDisabledState(WID_CS_START_DATE_DOWN,       _settings_newgame.game_creation.starting_year <= CalendarTime::MIN_YEAR);
-		this->SetWidgetDisabledState(WID_CS_START_DATE_UP,         _settings_newgame.game_creation.starting_year >= MAX_YEAR);
+		this->SetWidgetDisabledState(WID_CS_START_DATE_UP,         _settings_newgame.game_creation.starting_year >= CalendarTime::MAX_YEAR);
 		this->SetWidgetDisabledState(WID_CS_FLAT_LAND_HEIGHT_DOWN, _settings_newgame.game_creation.se_flat_world_height <= 0);
 		this->SetWidgetDisabledState(WID_CS_FLAT_LAND_HEIGHT_UP,   _settings_newgame.game_creation.se_flat_world_height >= GetMapHeightLimit());
 
@@ -1143,7 +1143,7 @@ struct CreateScenarioWindow : public Window
 		StringID str = STR_JUST_INT;
 		switch (widget) {
 			case WID_CS_START_DATE_TEXT:
-				SetDParam(0, TimerGameCalendar::ConvertYMDToDate(MAX_YEAR, 0, 1));
+				SetDParam(0, TimerGameCalendar::ConvertYMDToDate(CalendarTime::MAX_YEAR, 0, 1));
 				str = STR_JUST_DATE_LONG;
 				break;
 
@@ -1199,7 +1199,7 @@ struct CreateScenarioWindow : public Window
 					this->HandleButtonClick(widget);
 					this->SetDirty();
 
-					_settings_newgame.game_creation.starting_year = Clamp(_settings_newgame.game_creation.starting_year + widget - WID_CS_START_DATE_TEXT, MIN_YEAR, MAX_YEAR);
+					_settings_newgame.game_creation.starting_year = Clamp(_settings_newgame.game_creation.starting_year + widget - WID_CS_START_DATE_TEXT, CalendarTime::MIN_YEAR, CalendarTime::MAX_YEAR);
 				}
 				_left_button_clicked = false;
 				break;
@@ -1258,7 +1258,7 @@ struct CreateScenarioWindow : public Window
 			switch (this->widget_id) {
 				case WID_CS_START_DATE_TEXT:
 					this->SetWidgetDirty(WID_CS_START_DATE_TEXT);
-					_settings_newgame.game_creation.starting_year = Clamp(TimerGameCalendar::Year(value), MIN_YEAR, MAX_YEAR);
+					_settings_newgame.game_creation.starting_year = Clamp(TimerGameCalendar::Year(value), CalendarTime::MIN_YEAR, CalendarTime::MAX_YEAR);
 					break;
 
 				case WID_CS_FLAT_LAND_HEIGHT_TEXT:

src/graph_gui.cpp

@@ -16,12 +16,12 @@
 #include "cargotype.h"
 #include "strings_func.h"
 #include "window_func.h"
-#include "date_type.h"
 #include "gfx_func.h"
 #include "core/geometry_func.hpp"
 #include "currency.h"
 #include "timer/timer.h"
 #include "timer/timer_window.h"
+#include "timer/timer_game_tick.h"
 #include "timer/timer_game_calendar.h"
 #include "zoom_func.h"
 
@@ -1130,7 +1130,7 @@ struct PerformanceRatingDetailWindow : Window {
 			UpdateCompanyRatingAndValue(c, false);
 		}
 
-		this->timeout = DAY_TICKS * 5;
+		this->timeout = Ticks::DAY_TICKS * 5;
 	}
 
 	uint score_info_left;

src/industry_cmd.cpp

@@ -1155,7 +1155,7 @@ static void ProduceIndustryGoods(Industry *i)
 	i->counter--;
 
 	/* produce some cargo */
-	if ((i->counter % INDUSTRY_PRODUCE_TICKS) == 0) {
+	if ((i->counter % Ticks::INDUSTRY_PRODUCE_TICKS) == 0) {
 		if (HasBit(indsp->callback_mask, CBM_IND_PRODUCTION_256_TICKS)) IndustryProductionCallback(i, 1);
 
 		IndustryBehaviour indbehav = indsp->behaviour;
@@ -1188,7 +1188,7 @@ static void ProduceIndustryGoods(Industry *i)
 			if (cb_res != CALLBACK_FAILED) {
 				cut = ConvertBooleanCallback(indsp->grf_prop.grffile, CBID_INDUSTRY_SPECIAL_EFFECT, cb_res);
 			} else {
-				cut = ((i->counter % INDUSTRY_CUT_TREE_TICKS) == 0);
+				cut = ((i->counter % Ticks::INDUSTRY_CUT_TREE_TICKS) == 0);
 			}
 
 			if (cut) ChopLumberMillTrees(i);

src/linkgraph/flowmapper.cpp

@@ -50,7 +50,7 @@ void FlowMapper::Run(LinkGraphJob &job) const
 			/* Scale by time the graph has been running without being compressed. Add 1 to avoid
 			 * division by 0 if spawn date == last compression date. This matches
 			 * LinkGraph::Monthly(). */
-			auto runtime = job.JoinDate() - job.Settings().recalc_time / SECONDS_PER_DAY - job.LastCompression() + 1;
+			auto runtime = job.JoinDate() - job.Settings().recalc_time / CalendarTime::SECONDS_PER_DAY - job.LastCompression() + 1;
 			for (auto &it : flows) {
 				it.second.ScaleToMonthly(static_cast<int32_t>(runtime));
 			}

src/linkgraph/linkgraph.cpp

@@ -29,7 +29,7 @@ LinkGraph::BaseNode::BaseNode(TileIndex xy, StationID st, uint demand)
 	this->supply = 0;
 	this->demand = demand;
 	this->station = st;
-	this->last_update = INVALID_DATE;
+	this->last_update = CalendarTime::INVALID_DATE;
 }
 
 /**
@@ -40,8 +40,8 @@ LinkGraph::BaseEdge::BaseEdge(NodeID dest_node)
 	this->capacity = 0;
 	this->usage = 0;
 	this->travel_time_sum = 0;
-	this->last_unrestricted_update = INVALID_DATE;
+	this->last_unrestricted_update = CalendarTime::INVALID_DATE;
-	this->last_restricted_update = INVALID_DATE;
+	this->last_restricted_update = CalendarTime::INVALID_DATE;
 	this->dest_node = dest_node;
 }
 
@@ -55,10 +55,10 @@ void LinkGraph::ShiftDates(TimerGameCalendar::Date interval)
 	this->last_compression += interval;
 	for (NodeID node1 = 0; node1 < this->Size(); ++node1) {
 		BaseNode &source = this->nodes[node1];
-		if (source.last_update != INVALID_DATE) source.last_update += interval;
+		if (source.last_update != CalendarTime::INVALID_DATE) source.last_update += interval;
 		for (BaseEdge &edge : this->nodes[node1].edges) {
-			if (edge.last_unrestricted_update != INVALID_DATE) edge.last_unrestricted_update += interval;
+			if (edge.last_unrestricted_update != CalendarTime::INVALID_DATE) edge.last_unrestricted_update += interval;
-			if (edge.last_restricted_update != INVALID_DATE) edge.last_restricted_update += interval;
+			if (edge.last_restricted_update != CalendarTime::INVALID_DATE) edge.last_restricted_update += interval;
 		}
 	}
 }

src/linkgraph/linkgraph.h

@@ -13,7 +13,6 @@
 #include "../core/pool_type.hpp"
 #include "../station_base.h"
 #include "../cargotype.h"
-#include "../date_type.h"
 #include "../timer/timer_game_calendar.h"
 #include "../saveload/saveload.h"
 #include "linkgraph_type.h"
@@ -63,8 +62,8 @@ public:
 		TimerGameCalendar::Date LastUpdate() const { return std::max(this->last_unrestricted_update, this->last_restricted_update); }
 
 		void Update(uint capacity, uint usage, uint32_t time, EdgeUpdateMode mode);
-		void Restrict() { this->last_unrestricted_update = INVALID_DATE; }
+		void Restrict() { this->last_unrestricted_update = CalendarTime::INVALID_DATE; }
-		void Release() { this->last_restricted_update = INVALID_DATE; }
+		void Release() { this->last_restricted_update = CalendarTime::INVALID_DATE; }
 
 		/** Comparison operator based on \c dest_node. */
 		bool operator <(const BaseEdge &rhs) const

src/linkgraph/linkgraph_gui.cpp

@@ -12,6 +12,7 @@
 #include "../window_func.h"
 #include "../company_base.h"
 #include "../company_gui.h"
+#include "../timer/timer_game_tick.h"
 #include "../timer/timer_game_calendar.h"
 #include "../viewport_func.h"
 #include "../zoom_func.h"
@@ -221,7 +222,7 @@ void LinkGraphOverlay::AddLinks(const Station *from, const Station *to)
 			ConstEdge &edge = lg[ge.node][to->goods[c].node];
 			this->AddStats(c, lg.Monthly(edge.capacity), lg.Monthly(edge.usage),
 					ge.flows.GetFlowVia(to->index),
-					edge.TravelTime() / DAY_TICKS,
+					edge.TravelTime() / Ticks::DAY_TICKS,
 					from->owner == OWNER_NONE || to->owner == OWNER_NONE,
 					this->cached_links[from->index][to->index]);
 		}

src/linkgraph/linkgraphjob.cpp

@@ -37,7 +37,7 @@ LinkGraphJob::LinkGraphJob(const LinkGraph &orig) :
 		 * This is on purpose. */
 		link_graph(orig),
 		settings(_settings_game.linkgraph),
-		join_date(TimerGameCalendar::date + (_settings_game.linkgraph.recalc_time / SECONDS_PER_DAY)),
+		join_date(TimerGameCalendar::date + (_settings_game.linkgraph.recalc_time / CalendarTime::SECONDS_PER_DAY)),
 		job_completed(false),
 		job_aborted(false)
 {
@@ -131,14 +131,14 @@ LinkGraphJob::~LinkGraphJob()
 			if (st2 == nullptr || st2->goods[this->Cargo()].link_graph != this->link_graph.index ||
 					st2->goods[this->Cargo()].node != dest_id ||
 					!(*lg)[node_id].HasEdgeTo(dest_id) ||
-					(*lg)[node_id][dest_id].LastUpdate() == INVALID_DATE) {
+					(*lg)[node_id][dest_id].LastUpdate() == CalendarTime::INVALID_DATE) {
 				/* Edge has been removed. Delete flows. */
 				StationIDStack erased = flows.DeleteFlows(to);
 				/* Delete old flows for source stations which have been deleted
 				 * from the new flows. This avoids flow cycles between old and
 				 * new flows. */
 				while (!erased.IsEmpty()) ge.flows.erase(erased.Pop());
-			} else if ((*lg)[node_id][dest_id].last_restricted_update == INVALID_DATE) {
+			} else if ((*lg)[node_id][dest_id].last_restricted_update == CalendarTime::INVALID_DATE) {
 				/* Edge is fully restricted. */
 				flows.RestrictFlows(to);
 			}

src/linkgraph/linkgraphjob.h

@@ -178,7 +178,7 @@ public:
 	 * settings have to be brutally const-casted in order to populate them.
 	 */
 	LinkGraphJob() : settings(_settings_game.linkgraph),
-			join_date(INVALID_DATE), job_completed(false), job_aborted(false) {}
+			join_date(CalendarTime::INVALID_DATE), job_completed(false), job_aborted(false) {}
 
 	LinkGraphJob(const LinkGraph &orig);
 	~LinkGraphJob();

src/linkgraph/linkgraphschedule.cpp

@@ -178,7 +178,7 @@ void StateGameLoop_LinkGraphPauseControl()
 		}
 	} else if (_pause_mode == PM_UNPAUSED &&
 			TimerGameCalendar::date_fract == LinkGraphSchedule::SPAWN_JOIN_TICK - 2 &&
-			static_cast<int32_t>(TimerGameCalendar::date) % (_settings_game.linkgraph.recalc_interval / SECONDS_PER_DAY) == (_settings_game.linkgraph.recalc_interval / SECONDS_PER_DAY) / 2 &&
+			static_cast<int32_t>(TimerGameCalendar::date) % (_settings_game.linkgraph.recalc_interval / CalendarTime::SECONDS_PER_DAY) == (_settings_game.linkgraph.recalc_interval / CalendarTime::SECONDS_PER_DAY) / 2 &&
 			LinkGraphSchedule::instance.IsJoinWithUnfinishedJobDue()) {
 		/* Perform check two TimerGameCalendar::date_fract ticks before we would join, to make
 		 * sure it also works in multiplayer. */
@@ -205,10 +205,10 @@ void AfterLoad_LinkGraphPauseControl()
 void OnTick_LinkGraph()
 {
 	if (TimerGameCalendar::date_fract != LinkGraphSchedule::SPAWN_JOIN_TICK) return;
-	TimerGameCalendar::Date offset = static_cast<int32_t>(TimerGameCalendar::date) % (_settings_game.linkgraph.recalc_interval / SECONDS_PER_DAY);
+	TimerGameCalendar::Date offset = static_cast<int32_t>(TimerGameCalendar::date) % (_settings_game.linkgraph.recalc_interval / CalendarTime::SECONDS_PER_DAY);
 	if (offset == 0) {
 		LinkGraphSchedule::instance.SpawnNext();
-	} else if (offset == (_settings_game.linkgraph.recalc_interval / SECONDS_PER_DAY) / 2) {
+	} else if (offset == (_settings_game.linkgraph.recalc_interval / CalendarTime::SECONDS_PER_DAY) / 2) {
 		if (!_networking || _network_server) {
 			PerformanceMeasurer::SetInactive(PFE_GL_LINKGRAPH);
 			LinkGraphSchedule::instance.JoinNext();

src/linkgraph/mcf.cpp

@@ -2,6 +2,7 @@
 
 #include "../stdafx.h"
 #include "../core/math_func.hpp"
+#include "../timer/timer_game_tick.h"
 #include "mcf.h"
 
 #include "../safeguards.h"
@@ -290,7 +291,7 @@ void MultiCommodityFlow::Dijkstra(NodeID source_node, PathVector &paths)
 				IsCargoInClass(this->job.Cargo(), CC_EXPRESS);
 			uint distance = DistanceMaxPlusManhattan(this->job[from].base.xy, this->job[to].base.xy) + 1;
 			/* Compute a default travel time from the distance and an average speed of 1 tile/day. */
-			uint time = (edge.base.TravelTime() != 0) ? edge.base.TravelTime() + DAY_TICKS : distance * DAY_TICKS;
+			uint time = (edge.base.TravelTime() != 0) ? edge.base.TravelTime() + Ticks::DAY_TICKS : distance * Ticks::DAY_TICKS;
 			uint distance_anno = express ? time : distance;
 
 			Tannotation *dest = static_cast<Tannotation *>(paths[to]);

src/linkgraph/refresh.cpp

@@ -234,7 +234,7 @@ void LinkRefresher::RefreshStats(const Order *cur, const Order *next)
 			if (this->is_full_loading && this->vehicle->orders != nullptr &&
 					st->index == vehicle->last_station_visited &&
 					this->vehicle->orders->GetTotalDuration() >
-					(Ticks)this->vehicle->current_order_time) {
+					(TimerGameTick::Ticks)this->vehicle->current_order_time) {
 				uint effective_capacity = cargo_quantity * this->vehicle->load_unload_ticks;
 				if (effective_capacity > (uint)this->vehicle->orders->GetTotalDuration()) {
 					IncreaseStats(st, c, next_station, effective_capacity /

src/misc_gui.cpp

@@ -138,7 +138,7 @@ public:
 		/* Because build_date is not set yet in every TileDesc, we make sure it is empty */
 		TileDesc td;
 
-		td.build_date = INVALID_DATE;
+		td.build_date = CalendarTime::INVALID_DATE;
 
 		/* Most tiles have only one owner, but
 		 *  - drivethrough roadstops can be build on town owned roads (up to 2 owners) and
@@ -224,7 +224,7 @@ public:
 		this->landinfo_data.push_back(GetString(STR_LAND_AREA_INFORMATION_LOCAL_AUTHORITY));
 
 		/* Build date */
-		if (td.build_date != INVALID_DATE) {
+		if (td.build_date != CalendarTime::INVALID_DATE) {
 			SetDParam(0, td.build_date);
 			this->landinfo_data.push_back(GetString(STR_LAND_AREA_INFORMATION_BUILD_DATE));
 		}
@@ -573,7 +573,7 @@ void ShowCostOrIncomeAnimation(int x, int y, int z, Money cost)
 		msg = STR_INCOME_FLOAT_INCOME;
 	}
 	SetDParam(0, cost);
-	AddTextEffect(msg, pt.x, pt.y, DAY_TICKS, TE_RISING);
+	AddTextEffect(msg, pt.x, pt.y, Ticks::DAY_TICKS, TE_RISING);
 }
 
 /**
@@ -590,7 +590,7 @@ void ShowFeederIncomeAnimation(int x, int y, int z, Money transfer, Money income
 
 	SetDParam(0, transfer);
 	if (income == 0) {
-		AddTextEffect(STR_FEEDER, pt.x, pt.y, DAY_TICKS, TE_RISING);
+		AddTextEffect(STR_FEEDER, pt.x, pt.y, Ticks::DAY_TICKS, TE_RISING);
 	} else {
 		StringID msg = STR_FEEDER_COST;
 		if (income < 0) {
@@ -598,7 +598,7 @@ void ShowFeederIncomeAnimation(int x, int y, int z, Money transfer, Money income
 			msg = STR_FEEDER_INCOME;
 		}
 		SetDParam(1, income);
-		AddTextEffect(msg, pt.x, pt.y, DAY_TICKS, TE_RISING);
+		AddTextEffect(msg, pt.x, pt.y, Ticks::DAY_TICKS, TE_RISING);
 	}
 }
 

src/network/core/network_game_info.cpp

@@ -255,8 +255,6 @@ void SerializeNetworkGameInfo(Packet *p, const NetworkServerGameInfo *info, bool
  */
 void DeserializeNetworkGameInfo(Packet *p, NetworkGameInfo *info, const GameInfoNewGRFLookupTable *newgrf_lookup_table)
 {
-	static const TimerGameCalendar::Date MAX_DATE = TimerGameCalendar::ConvertYMDToDate(MAX_YEAR, 11, 31); // December is month 11
-
 	byte game_info_version = p->Recv_uint8();
 	NewGRFSerializationType newgrf_serialisation = NST_GRFID_MD5;
 
@@ -323,8 +321,8 @@ void DeserializeNetworkGameInfo(Packet *p, NetworkGameInfo *info, const GameInfo
 		}
 
 		case 3:
-			info->game_date      = Clamp(p->Recv_uint32(), 0, static_cast<int32_t>(MAX_DATE));
+			info->game_date      = Clamp(p->Recv_uint32(), 0, static_cast<int32_t>(CalendarTime::MAX_DATE));
-			info->start_date     = Clamp(p->Recv_uint32(), 0, static_cast<int32_t>(MAX_DATE));
+			info->start_date     = Clamp(p->Recv_uint32(), 0, static_cast<int32_t>(CalendarTime::MAX_DATE));
 			FALLTHROUGH;
 
 		case 2:
@@ -342,8 +340,8 @@ void DeserializeNetworkGameInfo(Packet *p, NetworkGameInfo *info, const GameInfo
 			info->clients_on     = p->Recv_uint8 ();
 			info->spectators_on  = p->Recv_uint8 ();
 			if (game_info_version < 3) { // 16 bits dates got scrapped and are read earlier
-				info->game_date    = p->Recv_uint16() + DAYS_TILL_ORIGINAL_BASE_YEAR;
+				info->game_date    = p->Recv_uint16() + CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
-				info->start_date   = p->Recv_uint16() + DAYS_TILL_ORIGINAL_BASE_YEAR;
+				info->start_date   = p->Recv_uint16() + CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
 			}
 			if (game_info_version < 6) while (p->Recv_uint8() != 0) {} // Used to contain the map-name.
 			info->map_width      = p->Recv_uint16();

src/network/network.cpp

@@ -11,6 +11,7 @@
 
 #include "../strings_func.h"
 #include "../command_func.h"
+#include "../timer/timer_game_tick.h"
 #include "../timer/timer_game_calendar.h"
 #include "network_admin.h"
 #include "network_client.h"
@@ -274,8 +275,8 @@ uint NetworkCalculateLag(const NetworkClientSocket *cs)
 	/* This client has missed their ACK packet after 1 DAY_TICKS..
 	 *  so we increase their lag for every frame that passes!
 	 * The packet can be out by a max of _net_frame_freq */
-	if (cs->last_frame_server + DAY_TICKS + _settings_client.network.frame_freq < _frame_counter) {
+	if (cs->last_frame_server + Ticks::DAY_TICKS + _settings_client.network.frame_freq < _frame_counter) {
-		lag += _frame_counter - (cs->last_frame_server + DAY_TICKS + _settings_client.network.frame_freq);
+		lag += _frame_counter - (cs->last_frame_server + Ticks::DAY_TICKS + _settings_client.network.frame_freq);
 	}
 	return lag;
 }

src/network/network_base.h

@@ -14,7 +14,6 @@
 #include "core/address.h"
 #include "../core/pool_type.hpp"
 #include "../company_type.h"
-#include "../date_type.h"
 #include "../timer/timer_game_calendar.h"
 
 /** Type for the pool with client information. */

src/network/network_client.cpp

@@ -20,6 +20,7 @@
 #include "../company_gui.h"
 #include "../company_cmd.h"
 #include "../core/random_func.hpp"
+#include "../timer/timer_game_tick.h"
 #include "../timer/timer_game_calendar.h"
 #include "../gfx_func.h"
 #include "../error.h"
@@ -876,7 +877,7 @@ NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_FRAME(Packet *p
 	/* Let the server know that we received this frame correctly
 	 *  We do this only once per day, to save some bandwidth ;) */
 	if (!_network_first_time && last_ack_frame < _frame_counter) {
-		last_ack_frame = _frame_counter + DAY_TICKS;
+		last_ack_frame = _frame_counter + Ticks::DAY_TICKS;
 		Debug(net, 7, "Sent ACK at {}", _frame_counter);
 		SendAck();
 	}

src/network/network_server.cpp

@@ -1141,7 +1141,7 @@ NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_ACK(Packet *p)
 	/* The client is trying to catch up with the server */
 	if (this->status == STATUS_PRE_ACTIVE) {
 		/* The client is not yet caught up? */
-		if (frame + DAY_TICKS < _frame_counter) return NETWORK_RECV_STATUS_OKAY;
+		if (frame + Ticks::DAY_TICKS < _frame_counter) return NETWORK_RECV_STATUS_OKAY;
 
 		/* Now it is! Unpause the game */
 		this->status = STATUS_ACTIVE;
@@ -1724,7 +1724,7 @@ void NetworkServer_Tick(bool send_frame)
 				 * did not receive a packet, then the client is not just
 				 * slow, but the connection is likely severed. Mentioning
 				 * frame_freq is not useful in this case. */
-				if (lag > (uint)DAY_TICKS && cs->lag_test == 0 && cs->last_packet + std::chrono::seconds(2) > std::chrono::steady_clock::now()) {
+				if (lag > (uint)Ticks::DAY_TICKS && cs->lag_test == 0 && cs->last_packet + std::chrono::seconds(2) > std::chrono::steady_clock::now()) {
 					IConsolePrint(CC_WARNING, "[{}] Client #{} is slow, try increasing [network.]frame_freq to a higher value!", _frame_counter, cs->client_id);
 					cs->lag_test = 1;
 				}

src/newgrf.cpp

@@ -996,7 +996,7 @@ static ChangeInfoResult CommonVehicleChangeInfo(EngineInfo *ei, int prop, ByteRe
 {
 	switch (prop) {
 		case 0x00: // Introduction date
-			ei->base_intro = buf->ReadWord() + DAYS_TILL_ORIGINAL_BASE_YEAR;
+			ei->base_intro = buf->ReadWord() + CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
 			break;
 
 		case 0x02: // Decay speed
@@ -2197,7 +2197,7 @@ static ChangeInfoResult BridgeChangeInfo(uint brid, int numinfo, int prop, ByteR
 			case 0x08: { // Year of availability
 				/* We treat '0' as always available */
 				byte year = buf->ReadByte();
-				bridge->avail_year = (year > 0 ? ORIGINAL_BASE_YEAR + year : 0);
+				bridge->avail_year = (year > 0 ? CalendarTime::ORIGINAL_BASE_YEAR + year : 0);
 				break;
 			}
 
@@ -2257,7 +2257,7 @@ static ChangeInfoResult BridgeChangeInfo(uint brid, int numinfo, int prop, ByteR
 				break;
 
 			case 0x0F: // Long format year of availability (year since year 0)
-				bridge->avail_year = Clamp(TimerGameCalendar::Year(buf->ReadDWord()), MIN_YEAR, MAX_YEAR);
+				bridge->avail_year = Clamp(TimerGameCalendar::Year(buf->ReadDWord()), CalendarTime::MIN_YEAR, CalendarTime::MAX_YEAR);
 				break;
 
 			case 0x10: { // purchase string
@@ -2430,8 +2430,8 @@ static ChangeInfoResult TownHouseChangeInfo(uint hid, int numinfo, int prop, Byt
 
 			case 0x0A: { // Availability years
 				uint16_t years = buf->ReadWord();
-				housespec->min_year = GB(years, 0, 8) > 150 ? MAX_YEAR : ORIGINAL_BASE_YEAR + GB(years, 0, 8);
+				housespec->min_year = GB(years, 0, 8) > 150 ? CalendarTime::MAX_YEAR : CalendarTime::ORIGINAL_BASE_YEAR + GB(years, 0, 8);
-				housespec->max_year = GB(years, 8, 8) > 150 ? MAX_YEAR : ORIGINAL_BASE_YEAR + GB(years, 8, 8);
+				housespec->max_year = GB(years, 8, 8) > 150 ? CalendarTime::MAX_YEAR : CalendarTime::ORIGINAL_BASE_YEAR + GB(years, 8, 8);
 				break;
 			}
 
@@ -3991,7 +3991,7 @@ static ChangeInfoResult AirportChangeInfo(uint airport, int numinfo, int prop, B
 			case 0x0C:
 				as->min_year = buf->ReadWord();
 				as->max_year = buf->ReadWord();
-				if (as->max_year == 0xFFFF) as->max_year = MAX_YEAR;
+				if (as->max_year == 0xFFFF) as->max_year = CalendarTime::MAX_YEAR;
 				break;
 
 			case 0x0D:
@@ -6512,11 +6512,11 @@ bool GetGlobalVariable(byte param, uint32_t *value, const GRFFile *grffile)
 {
 	switch (param) {
 		case 0x00: // current date
-			*value = static_cast<int32_t>(std::max(TimerGameCalendar::date - DAYS_TILL_ORIGINAL_BASE_YEAR, TimerGameCalendar::Date(0)));
+			*value = static_cast<int32_t>(std::max(TimerGameCalendar::date - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR, TimerGameCalendar::Date(0)));
 			return true;
 
 		case 0x01: // current year
-			*value = static_cast<int32_t>(Clamp(TimerGameCalendar::year, ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR) - ORIGINAL_BASE_YEAR);
+			*value = static_cast<int32_t>(Clamp(TimerGameCalendar::year, CalendarTime::ORIGINAL_BASE_YEAR, CalendarTime::ORIGINAL_MAX_YEAR) - CalendarTime::ORIGINAL_BASE_YEAR);
 			return true;
 
 		case 0x02: { // detailed date information: month of year (bit 0-7), day of month (bit 8-12), leap year (bit 15), day of year (bit 16-24)
@@ -7228,7 +7228,7 @@ static uint32_t GetPatchVariable(uint8_t param)
 {
 	switch (param) {
 		/* start year - 1920 */
-		case 0x0B: return static_cast<int32_t>(std::max(_settings_game.game_creation.starting_year, ORIGINAL_BASE_YEAR) - ORIGINAL_BASE_YEAR);
+		case 0x0B: return static_cast<int32_t>(std::max(_settings_game.game_creation.starting_year, CalendarTime::ORIGINAL_BASE_YEAR) - CalendarTime::ORIGINAL_BASE_YEAR);
 
 		/* freight trains weight factor */
 		case 0x0E: return _settings_game.vehicle.freight_trains;
@@ -9237,7 +9237,7 @@ static bool IsHouseSpecValid(HouseSpec *hs, const HouseSpec *next1, const HouseS
  */
 static void EnsureEarlyHouse(HouseZones bitmask)
 {
-	TimerGameCalendar::Year min_year = MAX_YEAR;
+	TimerGameCalendar::Year min_year = CalendarTime::MAX_YEAR;
 
 	for (int i = 0; i < NUM_HOUSES; i++) {
 		HouseSpec *hs = HouseSpec::Get(i);

src/newgrf_airport.cpp

@@ -212,7 +212,7 @@ void AirportOverrideManager::SetEntitySpec(AirportSpec *as)
 		case 0x7C: return (this->st->airport.psa != nullptr) ? this->st->airport.psa->GetValue(parameter) : 0;
 
 		case 0xF0: return this->st->facilities;
-		case 0xFA: return ClampTo<uint16_t>(this->st->build_date - DAYS_TILL_ORIGINAL_BASE_YEAR);
+		case 0xFA: return ClampTo<uint16_t>(this->st->build_date - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR);
 	}
 
 	return this->st->GetNewGRFVariable(this->ro, variable, parameter, available);

src/newgrf_airport.h

@@ -11,7 +11,6 @@
 #define NEWGRF_AIRPORT_H
 
 #include "airport.h"
-#include "date_type.h"
 #include "timer/timer_game_calendar.h"
 #include "newgrf_class.h"
 #include "newgrf_commons.h"

src/newgrf_engine.cpp

@@ -767,8 +767,8 @@ static uint32_t VehicleGetVariable(Vehicle *v, const VehicleScopeResolver *objec
 			}
 			return (variable - 0x80) == 0x10 ? ticks : GB(ticks, 8, 8);
 		}
-		case 0x12: return ClampTo<uint16_t>(v->date_of_last_service_newgrf - DAYS_TILL_ORIGINAL_BASE_YEAR);
+		case 0x12: return ClampTo<uint16_t>(v->date_of_last_service_newgrf - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR);
-		case 0x13: return GB(ClampTo<uint16_t>(v->date_of_last_service_newgrf - DAYS_TILL_ORIGINAL_BASE_YEAR), 8, 8);
+		case 0x13: return GB(ClampTo<uint16_t>(v->date_of_last_service_newgrf - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR), 8, 8);
 		case 0x14: return v->GetServiceInterval();
 		case 0x15: return GB(v->GetServiceInterval(), 8, 8);
 		case 0x16: return v->last_station_visited;
@@ -829,7 +829,7 @@ static uint32_t VehicleGetVariable(Vehicle *v, const VehicleScopeResolver *objec
 		case 0x41: return GB(ClampTo<uint16_t>(v->age), 8, 8);
 		case 0x42: return ClampTo<uint16_t>(v->max_age);
 		case 0x43: return GB(ClampTo<uint16_t>(v->max_age), 8, 8);
-		case 0x44: return static_cast<int32_t>(Clamp(v->build_year, ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR) - ORIGINAL_BASE_YEAR);
+		case 0x44: return static_cast<int32_t>(Clamp(v->build_year, CalendarTime::ORIGINAL_BASE_YEAR, CalendarTime::ORIGINAL_MAX_YEAR) - CalendarTime::ORIGINAL_BASE_YEAR);
 		case 0x45: return v->unitnumber;
 		case 0x46: return v->GetEngine()->grf_prop.local_id;
 		case 0x47: return GB(v->GetEngine()->grf_prop.local_id, 8, 8);
@@ -974,9 +974,9 @@ static uint32_t VehicleGetVariable(Vehicle *v, const VehicleScopeResolver *objec
 			case 0x48: return Engine::Get(this->self_type)->flags; // Vehicle Type Info
 			case 0x49: return static_cast<int32_t>(TimerGameCalendar::year); // 'Long' format build year
 			case 0x4B: return static_cast<int32_t>(TimerGameCalendar::date); // Long date of last service
-			case 0x92: return ClampTo<uint16_t>(TimerGameCalendar::date - DAYS_TILL_ORIGINAL_BASE_YEAR); // Date of last service
+			case 0x92: return ClampTo<uint16_t>(TimerGameCalendar::date - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR); // Date of last service
-			case 0x93: return GB(ClampTo<uint16_t>(TimerGameCalendar::date - DAYS_TILL_ORIGINAL_BASE_YEAR), 8, 8);
+			case 0x93: return GB(ClampTo<uint16_t>(TimerGameCalendar::date - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR), 8, 8);
-			case 0xC4: return static_cast<int32_t>(Clamp(TimerGameCalendar::year, ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR) - ORIGINAL_BASE_YEAR); // Build year
+			case 0xC4: return static_cast<int32_t>(Clamp(TimerGameCalendar::year, CalendarTime::ORIGINAL_BASE_YEAR, CalendarTime::ORIGINAL_MAX_YEAR) - CalendarTime::ORIGINAL_BASE_YEAR); // Build year
 			case 0xC6: return Engine::Get(this->self_type)->grf_prop.local_id;
 			case 0xC7: return GB(Engine::Get(this->self_type)->grf_prop.local_id, 8, 8);
 			case 0xDA: return INVALID_VEHICLE; // Next vehicle

src/newgrf_industries.cpp

@@ -396,16 +396,16 @@ static uint32_t GetCountAndDistanceOfClosestInstance(byte param_setID, byte layo
 		case 0xA6: return indspec->grf_prop.local_id;
 		case 0xA7: return this->industry->founder;
 		case 0xA8: return this->industry->random_colour;
-		case 0xA9: return ClampTo<uint8_t>(this->industry->last_prod_year - ORIGINAL_BASE_YEAR);
+		case 0xA9: return ClampTo<uint8_t>(this->industry->last_prod_year - CalendarTime::ORIGINAL_BASE_YEAR);
 		case 0xAA: return this->industry->counter;
 		case 0xAB: return GB(this->industry->counter, 8, 8);
 		case 0xAC: return this->industry->was_cargo_delivered;
 
-		case 0xB0: return ClampTo<uint16_t>(this->industry->construction_date - DAYS_TILL_ORIGINAL_BASE_YEAR); // Date when built since 1920 (in days)
+		case 0xB0: return ClampTo<uint16_t>(this->industry->construction_date - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR); // Date when built since 1920 (in days)
 		case 0xB3: return this->industry->construction_type; // Construction type
 		case 0xB4: {
 			auto it = std::max_element(std::begin(this->industry->accepted), std::end(this->industry->accepted), [](const auto &a, const auto &b) { return a.last_accepted < b.last_accepted; });
-			return ClampTo<uint16_t>(it->last_accepted - DAYS_TILL_ORIGINAL_BASE_YEAR); // Date last cargo accepted since 1920 (in days)
+			return ClampTo<uint16_t>(it->last_accepted - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR); // Date last cargo accepted since 1920 (in days)
 		}
 	}
 

src/newgrf_profiling.h

@@ -11,7 +11,6 @@
 #define NEWGRF_PROFILING_H
 
 #include "stdafx.h"
-#include "date_type.h"
 #include "timer/timer_game_calendar.h"
 #include "newgrf.h"
 #include "newgrf_callbacks.h"

src/newgrf_roadstop.cpp

@@ -173,7 +173,7 @@ uint32_t RoadStopScopeResolver::GetVariable(byte variable, uint32_t parameter, b
 
 		case 0xF0: return this->st == nullptr ? 0 : this->st->facilities; // facilities
 
-		case 0xFA: return ClampTo<uint16_t>((this->st == nullptr ? TimerGameCalendar::date : this->st->build_date) - DAYS_TILL_ORIGINAL_BASE_YEAR); // build date
+		case 0xFA: return ClampTo<uint16_t>((this->st == nullptr ? TimerGameCalendar::date : this->st->build_date) - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR); // build date
 	}
 
 	if (this->st != nullptr) return this->st->GetNewGRFVariable(this->ro, variable, parameter, available);

src/newgrf_station.cpp

@@ -291,7 +291,7 @@ TownScopeResolver *StationResolverObject::GetTown()
 				}
 				break;
 
-			case 0xFA: return ClampTo<uint16_t>(TimerGameCalendar::date - DAYS_TILL_ORIGINAL_BASE_YEAR); // Build date, clamped to a 16 bit value
+			case 0xFA: return ClampTo<uint16_t>(TimerGameCalendar::date - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR); // Build date, clamped to a 16 bit value
 		}
 
 		*available = false;
@@ -381,7 +381,7 @@ TownScopeResolver *StationResolverObject::GetTown()
 		case 0x84: return this->st->string_id;
 		case 0x86: return 0;
 		case 0xF0: return this->st->facilities;
-		case 0xFA: return ClampTo<uint16_t>(this->st->build_date - DAYS_TILL_ORIGINAL_BASE_YEAR);
+		case 0xFA: return ClampTo<uint16_t>(this->st->build_date - CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR);
 	}
 
 	return this->st->GetNewGRFVariable(this->ro, variable, parameter, available);

src/newgrf_text.cpp

@@ -23,7 +23,7 @@
 #include "newgrf_text.h"
 #include "newgrf_cargo.h"
 #include "string_func.h"
-#include "date_type.h"
+#include "timer/timer_game_calendar.h"
 #include "debug.h"
 #include "core/alloc_type.hpp"
 #include "language.h"
@@ -912,7 +912,7 @@ uint RemapNewGRFStringControlCode(uint scc, const char **str, StringParameters &
 
 			/* Dates from NewGRFs have 1920-01-01 as their zero point, convert it to OpenTTD's epoch. */
 			case SCC_NEWGRF_PRINT_WORD_DATE_LONG:
-			case SCC_NEWGRF_PRINT_WORD_DATE_SHORT:  parameters.SetParam(0, _newgrf_textrefstack.PopUnsignedWord() + DAYS_TILL_ORIGINAL_BASE_YEAR); break;
+			case SCC_NEWGRF_PRINT_WORD_DATE_SHORT:  parameters.SetParam(0, _newgrf_textrefstack.PopUnsignedWord() + CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR); break;
 
 			case SCC_NEWGRF_DISCARD_WORD:           _newgrf_textrefstack.PopUnsignedWord(); break;
 

src/newgrf_town.cpp

@@ -11,6 +11,7 @@
 #include "debug.h"
 #include "town.h"
 #include "newgrf_town.h"
+#include "timer/timer_game_tick.h"
 
 #include "safeguards.h"
 
@@ -47,7 +48,7 @@
 		case 0x81: return GB(static_cast<uint32_t>(this->t->xy), 8, 8);
 		case 0x82: return ClampTo<uint16_t>(this->t->cache.population);
 		case 0x83: return GB(ClampTo<uint16_t>(this->t->cache.population), 8, 8);
-		case 0x8A: return this->t->grow_counter / TOWN_GROWTH_TICKS;
+		case 0x8A: return this->t->grow_counter / Ticks::TOWN_GROWTH_TICKS;
 		case 0x92: return this->t->flags;  // In original game, 0x92 and 0x93 are really one word. Since flags is a byte, this is to adjust
 		case 0x93: return 0;
 		case 0x94: return ClampTo<uint16_t>(this->t->cache.squared_town_zone_radius[0]);
@@ -79,7 +80,7 @@
 		case 0xAE: return this->t->have_ratings;
 		case 0xB2: return this->t->statues;
 		case 0xB6: return ClampTo<uint16_t>(this->t->cache.num_houses);
-		case 0xB9: return this->t->growth_rate / TOWN_GROWTH_TICKS;
+		case 0xB9: return this->t->growth_rate / Ticks::TOWN_GROWTH_TICKS;
 		case 0xBA: return ClampTo<uint16_t>(this->t->supplied[CT_PASSENGERS].new_max);
 		case 0xBB: return GB(ClampTo<uint16_t>(this->t->supplied[CT_PASSENGERS].new_max), 8, 8);
 		case 0xBC: return ClampTo<uint16_t>(this->t->supplied[CT_MAIL].new_max);

src/news_gui.cpp

@@ -1134,7 +1134,7 @@ struct MessageHistoryWindow : Window {
 
 			/* Months are off-by-one, so it's actually 8. Not using
 			 * month 12 because the 1 is usually less wide. */
-			SetDParam(0, TimerGameCalendar::ConvertYMDToDate(ORIGINAL_MAX_YEAR, 7, 30));
+			SetDParam(0, TimerGameCalendar::ConvertYMDToDate(CalendarTime::ORIGINAL_MAX_YEAR, 7, 30));
 			this->date_width = GetStringBoundingBox(STR_JUST_DATE_TINY).width + WidgetDimensions::scaled.hsep_wide;
 
 			size->height = 4 * resize->height + WidgetDimensions::scaled.framerect.Vertical(); // At least 4 lines are visible.

src/openttd.cpp

@@ -380,7 +380,7 @@ void OpenBrowser(const char *url)
 
 /** Callback structure of statements to be executed after the NewGRF scan. */
 struct AfterNewGRFScan : NewGRFScanCallback {
-	TimerGameCalendar::Year startyear = INVALID_YEAR; ///< The start year.
+	TimerGameCalendar::Year startyear = CalendarTime::INVALID_YEAR; ///< The start year.
 	uint32_t generation_seed = GENERATE_NEW_SEED; ///< Seed for the new game.
 	std::string dedicated_host;                 ///< Hostname for the dedicated server.
 	uint16_t dedicated_port = 0;                  ///< Port for the dedicated server.
@@ -429,7 +429,7 @@ struct AfterNewGRFScan : NewGRFScanCallback {
 		MusicDriver::GetInstance()->SetVolume(_settings_client.music.music_vol);
 		SetEffectVolume(_settings_client.music.effect_vol);
 
-		if (startyear != INVALID_YEAR) IConsoleSetSetting("game_creation.starting_year", static_cast<int32_t>(startyear));
+		if (startyear != CalendarTime::INVALID_YEAR) IConsoleSetSetting("game_creation.starting_year", static_cast<int32_t>(startyear));
 		if (generation_seed != GENERATE_NEW_SEED) _settings_newgame.game_creation.generation_seed = generation_seed;
 
 		if (!dedicated_host.empty()) {

src/order_base.h

@@ -17,7 +17,7 @@
 #include "depot_type.h"
 #include "station_type.h"
 #include "vehicle_type.h"
-#include "date_type.h"
+#include "timer/timer_game_tick.h"
 #include "saveload/saveload.h"
 
 typedef Pool<Order, OrderID, 256, 0xFF0000> OrderPool;
@@ -268,8 +268,8 @@ private:
 	uint num_vehicles;                ///< NOSAVE: Number of vehicles that share this order list.
 	Vehicle *first_shared;            ///< NOSAVE: pointer to the first vehicle in the shared order chain.
 
-	Ticks timetable_duration;         ///< NOSAVE: Total timetabled duration of the order list.
+	TimerGameTick::Ticks timetable_duration;         ///< NOSAVE: Total timetabled duration of the order list.
-	Ticks total_duration;             ///< NOSAVE: Total (timetabled or not) duration of the order list.
+	TimerGameTick::Ticks total_duration;             ///< NOSAVE: Total (timetabled or not) duration of the order list.
 
 public:
 	/** Default constructor producing an invalid order list. */
@@ -366,34 +366,34 @@ public:
 	bool IsCompleteTimetable() const;
 
 	/**
-	 * Gets the total duration of the vehicles timetable or INVALID_TICKS is the timetable is not complete.
+	 * Gets the total duration of the vehicles timetable or Ticks::INVALID_TICKS is the timetable is not complete.
-	 * @return total timetable duration or INVALID_TICKS for incomplete timetables
+	 * @return total timetable duration or Ticks::INVALID_TICKS for incomplete timetables
 	 */
-	inline Ticks GetTimetableTotalDuration() const { return this->IsCompleteTimetable() ? this->timetable_duration : INVALID_TICKS; }
+	inline TimerGameTick::Ticks GetTimetableTotalDuration() const { return this->IsCompleteTimetable() ? this->timetable_duration : Ticks::INVALID_TICKS; }
 
 	/**
 	 * Gets the known duration of the vehicles timetable even if the timetable is not complete.
 	 * @return known timetable duration
 	 */
-	inline Ticks GetTimetableDurationIncomplete() const { return this->timetable_duration; }
+	inline TimerGameTick::Ticks GetTimetableDurationIncomplete() const { return this->timetable_duration; }
 
 	/**
 	 * Gets the known duration of the vehicles orders, timetabled or not.
 	 * @return  known order duration.
 	 */
-	inline Ticks GetTotalDuration() const { return this->total_duration; }
+	inline TimerGameTick::Ticks GetTotalDuration() const { return this->total_duration; }
 
 	/**
 	 * Must be called if an order's timetable is changed to update internal book keeping.
 	 * @param delta By how many ticks has the timetable duration changed
 	 */
-	void UpdateTimetableDuration(Ticks delta) { this->timetable_duration += delta; }
+	void UpdateTimetableDuration(TimerGameTick::Ticks delta) { this->timetable_duration += delta; }
 
 	/**
 	 * Must be called if an order's timetable is changed to update internal book keeping.
 	 * @param delta By how many ticks has the total duration changed
 	 */
-	void UpdateTotalDuration(Ticks delta) { this->total_duration += delta; }
+	void UpdateTotalDuration(TimerGameTick::Ticks delta) { this->total_duration += delta; }
 
 	void FreeChain(bool keep_orderlist = false);
 

src/order_cmd.cpp

@@ -619,8 +619,8 @@ void OrderList::DebugCheckSanity() const
 	VehicleOrderID check_num_orders = 0;
 	VehicleOrderID check_num_manual_orders = 0;
 	uint check_num_vehicles = 0;
-	Ticks check_timetable_duration = 0;
+	TimerGameTick::Ticks check_timetable_duration = 0;
-	Ticks check_total_duration = 0;
+	TimerGameTick::Ticks check_total_duration = 0;
 
 	Debug(misc, 6, "Checking OrderList {} for sanity...", this->index);
 
@@ -1947,10 +1947,10 @@ VehicleOrderID ProcessConditionalOrder(const Order *order, const Vehicle *v)
 		case OCV_RELIABILITY:        skip_order = OrderConditionCompare(occ, ToPercent16(v->reliability),       value); break;
 		case OCV_MAX_RELIABILITY:    skip_order = OrderConditionCompare(occ, ToPercent16(v->GetEngine()->reliability),   value); break;
 		case OCV_MAX_SPEED:          skip_order = OrderConditionCompare(occ, v->GetDisplayMaxSpeed() * 10 / 16, value); break;
-		case OCV_AGE:                skip_order = OrderConditionCompare(occ, DateToYear(v->age),                value); break;
+		case OCV_AGE:                skip_order = OrderConditionCompare(occ, TimerGameCalendar::DateToYear(v->age),                value); break;
 		case OCV_REQUIRES_SERVICE:   skip_order = OrderConditionCompare(occ, v->NeedsServicing(),               value); break;
 		case OCV_UNCONDITIONALLY:    skip_order = true; break;
-		case OCV_REMAINING_LIFETIME: skip_order = OrderConditionCompare(occ, std::max(DateToYear(v->max_age - v->age + DAYS_IN_LEAP_YEAR - 1), TimerGameCalendar::Year(0)), value); break;
+		case OCV_REMAINING_LIFETIME: skip_order = OrderConditionCompare(occ, std::max(TimerGameCalendar::DateToYear(v->max_age - v->age + CalendarTime::DAYS_IN_LEAP_YEAR - 1), TimerGameCalendar::Year(0)), value); break;
 		default: NOT_REACHED();
 	}
 

src/rail.cpp

@@ -225,7 +225,7 @@ RailTypes AddDateIntroducedRailTypes(RailTypes current, TimerGameCalendar::Date
 		if (rti->label == 0) continue;
 
 		/* Not date introduced. */
-		if (!IsInsideMM(rti->introduction_date, 0, static_cast<int32_t>(MAX_DATE))) continue;
+		if (!IsInsideMM(rti->introduction_date, 0, static_cast<int32_t>(CalendarTime::MAX_DATE))) continue;
 
 		/* Not yet introduced at this date. */
 		if (rti->introduction_date > date) continue;
@@ -256,7 +256,7 @@ RailTypes GetCompanyRailtypes(CompanyID company, bool introduces)
 		const EngineInfo *ei = &e->info;
 
 		if (HasBit(ei->climates, _settings_game.game_creation.landscape) &&
-				(HasBit(e->company_avail, company) || TimerGameCalendar::date >= e->intro_date + DAYS_IN_YEAR)) {
+				(HasBit(e->company_avail, company) || TimerGameCalendar::date >= e->intro_date + CalendarTime::DAYS_IN_YEAR)) {
 			const RailVehicleInfo *rvi = &e->u.rail;
 
 			if (rvi->railveh_type != RAILVEH_WAGON) {
@@ -298,7 +298,7 @@ RailTypes GetRailTypes(bool introduces)
 		}
 	}
 
-	if (introduces) return AddDateIntroducedRailTypes(rts, MAX_DATE);
+	if (introduces) return AddDateIntroducedRailTypes(rts, CalendarTime::MAX_DATE);
 	return rts;
 }
 

src/rail.h

@@ -17,7 +17,6 @@
 #include "economy_func.h"
 #include "slope_type.h"
 #include "strings_type.h"
-#include "date_type.h"
 #include "timer/timer_game_calendar.h"
 #include "signal_type.h"
 #include "settings_type.h"

src/road.cpp

@@ -115,7 +115,7 @@ bool HasRoadTypeAvail(const CompanyID company, RoadType roadtype)
 		if (rti->label == 0) return false;
 
 		/* Not yet introduced at this date. */
-		if (IsInsideMM(rti->introduction_date, 0, static_cast<int32_t>(MAX_DATE)) && rti->introduction_date > TimerGameCalendar::date) return false;
+		if (IsInsideMM(rti->introduction_date, 0, static_cast<int32_t>(CalendarTime::MAX_DATE)) && rti->introduction_date > TimerGameCalendar::date) return false;
 
 		/*
 		 * Do not allow building hidden road types, except when a town may build it.
@@ -173,7 +173,7 @@ RoadTypes AddDateIntroducedRoadTypes(RoadTypes current, TimerGameCalendar::Date
 		if (rti->label == 0) continue;
 
 		/* Not date introduced. */
-		if (!IsInsideMM(rti->introduction_date, 0, static_cast<int32_t>(MAX_DATE))) continue;
+		if (!IsInsideMM(rti->introduction_date, 0, static_cast<int32_t>(CalendarTime::MAX_DATE))) continue;
 
 		/* Not yet introduced at this date. */
 		if (rti->introduction_date > date) continue;
@@ -204,7 +204,7 @@ RoadTypes GetCompanyRoadTypes(CompanyID company, bool introduces)
 		const EngineInfo *ei = &e->info;
 
 		if (HasBit(ei->climates, _settings_game.game_creation.landscape) &&
-				(HasBit(e->company_avail, company) || TimerGameCalendar::date >= e->intro_date + DAYS_IN_YEAR)) {
+				(HasBit(e->company_avail, company) || TimerGameCalendar::date >= e->intro_date + CalendarTime::DAYS_IN_YEAR)) {
 			const RoadVehicleInfo *rvi = &e->u.road;
 			assert(rvi->roadtype < ROADTYPE_END);
 			if (introduces) {
@@ -241,7 +241,7 @@ RoadTypes GetRoadTypes(bool introduces)
 		}
 	}
 
-	if (introduces) return AddDateIntroducedRoadTypes(rts, MAX_DATE);
+	if (introduces) return AddDateIntroducedRoadTypes(rts, CalendarTime::MAX_DATE);
 	return rts;
 }
 
@@ -302,7 +302,7 @@ RoadTypes ExistingRoadTypes(CompanyID c)
 	}
 
 	/* Get the date introduced roadtypes as well. */
-	known_roadtypes = AddDateIntroducedRoadTypes(known_roadtypes, MAX_DATE);
+	known_roadtypes = AddDateIntroducedRoadTypes(known_roadtypes, CalendarTime::MAX_DATE);
 
 	return known_roadtypes;
 }

src/road_cmd.cpp

@@ -150,7 +150,7 @@ RoadType AllocateRoadType(RoadTypeLabel label, RoadTramType rtt)
 			rti->label = label;
 			rti->alternate_labels.clear();
 			rti->flags = ROTFB_NONE;
-			rti->introduction_date = INVALID_DATE;
+			rti->introduction_date = CalendarTime::INVALID_DATE;
 
 			/* Make us compatible with ourself. */
 			rti->powered_roadtypes = (RoadTypes)(1ULL << rt);

src/roadveh_cmd.cpp

@@ -1720,7 +1720,7 @@ void RoadVehicle::OnNewDay()
 
 	if (this->running_ticks == 0) return;
 
-	CommandCost cost(EXPENSES_ROADVEH_RUN, this->GetRunningCost() * this->running_ticks / (DAYS_IN_YEAR * DAY_TICKS));
+	CommandCost cost(EXPENSES_ROADVEH_RUN, this->GetRunningCost() * this->running_ticks / (CalendarTime::DAYS_IN_YEAR * Ticks::DAY_TICKS));
 
 	this->profit_this_year -= cost.GetCost();
 	this->running_ticks = 0;

src/saveload/afterload.cpp

@@ -259,7 +259,7 @@ static void InitializeWindowsAndCaches()
 		/* For each company, verify (while loading a scenario) that the inauguration date is the current year and set it
 		 * accordingly if it is not the case.  No need to set it on companies that are not been used already,
 		 * thus the MIN_YEAR (which is really nothing more than Zero, initialized value) test */
-		if (_file_to_saveload.abstract_ftype == FT_SCENARIO && c->inaugurated_year != MIN_YEAR) {
+		if (_file_to_saveload.abstract_ftype == FT_SCENARIO && c->inaugurated_year != CalendarTime::MIN_YEAR) {
 			c->inaugurated_year = TimerGameCalendar::year;
 		}
 	}
@@ -727,7 +727,7 @@ bool AfterLoadGame()
 	}
 
 	/* The value of TimerGameCalendar::date_fract got divided, so make sure that old games are converted correctly. */
-	if (IsSavegameVersionBefore(SLV_11, 1) || (IsSavegameVersionBefore(SLV_147) && TimerGameCalendar::date_fract > DAY_TICKS)) TimerGameCalendar::date_fract /= 885;
+	if (IsSavegameVersionBefore(SLV_11, 1) || (IsSavegameVersionBefore(SLV_147) && TimerGameCalendar::date_fract > Ticks::DAY_TICKS)) TimerGameCalendar::date_fract /= 885;
 
 	/* Update current year
 	 * must be done before loading sprites as some newgrfs check it */
@@ -776,13 +776,13 @@ bool AfterLoadGame()
 	}
 
 	if (IsSavegameVersionBefore(SLV_ENDING_YEAR)) {
-		_settings_game.game_creation.ending_year = DEF_END_YEAR;
+		_settings_game.game_creation.ending_year = CalendarTime::DEF_END_YEAR;
 	}
 
 	/* Convert linkgraph update settings from days to seconds. */
 	if (IsSavegameVersionBefore(SLV_LINKGRAPH_SECONDS)) {
-		_settings_game.linkgraph.recalc_interval *= SECONDS_PER_DAY;
+		_settings_game.linkgraph.recalc_interval *= CalendarTime::SECONDS_PER_DAY;
-		_settings_game.linkgraph.recalc_time     *= SECONDS_PER_DAY;
+		_settings_game.linkgraph.recalc_time     *= CalendarTime::SECONDS_PER_DAY;
 	}
 
 	/* Load the sprites */
@@ -1422,18 +1422,18 @@ bool AfterLoadGame()
 	/* Time starts at 0 instead of 1920.
 	 * Account for this in older games by adding an offset */
 	if (IsSavegameVersionBefore(SLV_31)) {
-		TimerGameCalendar::date += DAYS_TILL_ORIGINAL_BASE_YEAR;
+		TimerGameCalendar::date += CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
-		TimerGameCalendar::year += ORIGINAL_BASE_YEAR;
+		TimerGameCalendar::year += CalendarTime::ORIGINAL_BASE_YEAR;
 
-		for (Station *st : Station::Iterate())   st->build_date      += DAYS_TILL_ORIGINAL_BASE_YEAR;
+		for (Station *st : Station::Iterate())   st->build_date      += CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
-		for (Waypoint *wp : Waypoint::Iterate()) wp->build_date      += DAYS_TILL_ORIGINAL_BASE_YEAR;
+		for (Waypoint *wp : Waypoint::Iterate()) wp->build_date      += CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
-		for (Engine *e : Engine::Iterate())      e->intro_date       += DAYS_TILL_ORIGINAL_BASE_YEAR;
+		for (Engine *e : Engine::Iterate())      e->intro_date       += CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
-		for (Company *c : Company::Iterate()) c->inaugurated_year += ORIGINAL_BASE_YEAR;
+		for (Company *c : Company::Iterate()) c->inaugurated_year += CalendarTime::ORIGINAL_BASE_YEAR;
-		for (Industry *i : Industry::Iterate())  i->last_prod_year   += ORIGINAL_BASE_YEAR;
+		for (Industry *i : Industry::Iterate())  i->last_prod_year   += CalendarTime::ORIGINAL_BASE_YEAR;
 
 		for (Vehicle *v : Vehicle::Iterate()) {
-			v->date_of_last_service += DAYS_TILL_ORIGINAL_BASE_YEAR;
+			v->date_of_last_service += CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
-			v->build_year += ORIGINAL_BASE_YEAR;
+			v->build_year += CalendarTime::ORIGINAL_BASE_YEAR;
 		}
 	}
 
@@ -1925,7 +1925,7 @@ bool AfterLoadGame()
 
 			/* Replace "house construction year" with "house age" */
 			if (IsTileType(t, MP_HOUSE) && IsHouseCompleted(t)) {
-				t.m5() = ClampTo<uint8_t>(TimerGameCalendar::year - (t.m5() + ORIGINAL_BASE_YEAR));
+				t.m5() = ClampTo<uint8_t>(TimerGameCalendar::year - (t.m5() + CalendarTime::ORIGINAL_BASE_YEAR));
 			}
 		}
 	}
@@ -2999,7 +2999,7 @@ bool AfterLoadGame()
 				t->growth_rate = TownTicksToGameTicks(t->growth_rate & ~0x8000);
 			}
 			/* Add t->index % TOWN_GROWTH_TICKS to spread growth across ticks. */
-			t->grow_counter = TownTicksToGameTicks(t->grow_counter) + t->index % TOWN_GROWTH_TICKS;
+			t->grow_counter = TownTicksToGameTicks(t->grow_counter) + t->index % Ticks::TOWN_GROWTH_TICKS;
 		}
 	}
 

src/saveload/misc_sl.cpp

@@ -20,7 +20,6 @@
 #include "../gfx_func.h"
 #include "../core/random_func.hpp"
 #include "../fios.h"
-#include "../date_type.h"
 #include "../timer/timer.h"
 #include "../timer/timer_game_tick.h"
 
@@ -135,7 +134,7 @@ struct DATEChunkHandler : ChunkHandler {
 		this->LoadCommon(_date_check_desc, _date_check_sl_compat);
 
 		if (IsSavegameVersionBefore(SLV_31)) {
-			_load_check_data.current_date += DAYS_TILL_ORIGINAL_BASE_YEAR;
+			_load_check_data.current_date += CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
 		}
 	}
 };

src/saveload/oldloader_sl.cpp

@@ -398,7 +398,7 @@ static bool FixTTOEngines()
 		for (uint i = 0; i < lengthof(_orig_aircraft_vehicle_info); i++, j++) new (GetTempDataEngine(j)) Engine(VEH_AIRCRAFT, i);
 	}
 
-	TimerGameCalendar::Date aging_date = std::min(TimerGameCalendar::date + DAYS_TILL_ORIGINAL_BASE_YEAR, TimerGameCalendar::ConvertYMDToDate(2050, 0, 1));
+	TimerGameCalendar::Date aging_date = std::min(TimerGameCalendar::date + CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR, TimerGameCalendar::ConvertYMDToDate(2050, 0, 1));
 
 	for (EngineID i = 0; i < 256; i++) {
 		int oi = ttd_to_tto[i];
@@ -406,11 +406,11 @@ static bool FixTTOEngines()
 
 		if (oi == 255) {
 			/* Default engine is used */
-			TimerGameCalendar::date += DAYS_TILL_ORIGINAL_BASE_YEAR;
+			TimerGameCalendar::date += CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
 			StartupOneEngine(e, aging_date, 0);
 			CalcEngineReliability(e, false);
-			e->intro_date -= DAYS_TILL_ORIGINAL_BASE_YEAR;
+			e->intro_date -= CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
-			TimerGameCalendar::date -= DAYS_TILL_ORIGINAL_BASE_YEAR;
+			TimerGameCalendar::date -= CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
 
 			/* Make sure for example monorail and maglev are available when they should be */
 			if (TimerGameCalendar::date >= e->intro_date && HasBit(e->info.climates, 0)) {
@@ -1020,7 +1020,7 @@ static bool LoadOldCompany(LoadgameState *ls, int num)
 	}
 
 	_company_colours[num] = (Colours)c->colour;
-	c->inaugurated_year -= ORIGINAL_BASE_YEAR;
+	c->inaugurated_year -= CalendarTime::ORIGINAL_BASE_YEAR;
 
 	return true;
 }
@@ -1353,7 +1353,7 @@ bool LoadOldVehicle(LoadgameState *ls, int num)
 		if (_cargo_count != 0 && CargoPacket::CanAllocateItem()) {
 			StationID source =    (_cargo_source == 0xFF) ? INVALID_STATION : _cargo_source;
 			TileIndex source_xy = (source != INVALID_STATION) ? Station::Get(source)->xy : (TileIndex)0;
-			v->cargo.Append(new CargoPacket(_cargo_count, _cargo_periods, source, source_xy));
+			v->cargo.Append(new CargoPacket(_cargo_count, _cargo_periods, source, INVALID_STATION, source_xy));
 		}
 	}
 

src/saveload/station_sl.cpp

@@ -449,7 +449,7 @@ public:
 					assert(CargoPacket::CanAllocateItem());
 
 					/* Don't construct the packet with station here, because that'll fail with old savegames */
-					CargoPacket *cp = new CargoPacket(GB(_waiting_acceptance, 0, 12), _cargo_periods, source, _cargo_source_xy, _cargo_feeder_share);
+					CargoPacket *cp = new CargoPacket(GB(_waiting_acceptance, 0, 12), _cargo_periods, source, INVALID_STATION, _cargo_source_xy, _cargo_feeder_share);
 					ge->cargo.Append(cp, INVALID_STATION);
 					SB(ge->status, GoodsEntry::GES_RATING, 1, 1);
 				}

src/saveload/vehicle_sl.cpp

@@ -1041,7 +1041,7 @@ struct VEHSChunkHandler : ChunkHandler {
 
 			if (_cargo_count != 0 && IsCompanyBuildableVehicleType(v) && CargoPacket::CanAllocateItem()) {
 				/* Don't construct the packet with station here, because that'll fail with old savegames */
-				CargoPacket *cp = new CargoPacket(_cargo_count, _cargo_periods, _cargo_source, _cargo_source_xy, _cargo_feeder_share);
+				CargoPacket *cp = new CargoPacket(_cargo_count, _cargo_periods, _cargo_source, INVALID_STATION, _cargo_source_xy, _cargo_feeder_share);
 				v->cargo.Append(cp);
 			}
 

src/script/api/script_date.cpp

@@ -56,7 +56,7 @@
 {
 	if (month < 1 || month > 12) return DATE_INVALID;
 	if (day_of_month < 1 || day_of_month > 31) return DATE_INVALID;
-	if (year < 0 || year > MAX_YEAR) return DATE_INVALID;
+	if (year < 0 || year > CalendarTime::MAX_YEAR) return DATE_INVALID;
 
 	return (ScriptDate::Date)(int32_t)::TimerGameCalendar::ConvertYMDToDate(year, month - 1, day_of_month);
 }

src/script/api/script_date.hpp

@@ -11,7 +11,7 @@
 #define SCRIPT_DATE_HPP
 
 #include "script_object.hpp"
-#include "../../date_type.h"
+#include "timer/timer_game_calendar.h"
 
 /**
  * Class that handles all date related (calculation) functions.
@@ -31,7 +31,7 @@ public:
 	 * compose valid date values for a known year, month and day.
 	 */
 	enum Date {
-		DATE_INVALID = (int32_t)::INVALID_DATE, ///< A value representing an invalid date.
+		DATE_INVALID = (int32_t)::CalendarTime::INVALID_DATE, ///< A value representing an invalid date.
 	};
 
 	/**

src/script/api/script_town.cpp

@@ -171,9 +171,9 @@
 			break;
 
 		default:
-			EnforcePrecondition(false, (days_between_town_growth * DAY_TICKS / TOWN_GROWTH_TICKS) <= MAX_TOWN_GROWTH_TICKS);
+			EnforcePrecondition(false, (days_between_town_growth * ::Ticks::DAY_TICKS / ::Ticks::TOWN_GROWTH_TICKS) <= MAX_TOWN_GROWTH_TICKS);
 			/* Don't use growth_rate 0 as it means GROWTH_NORMAL */
-			growth_rate = std::max<SQInteger>(days_between_town_growth * DAY_TICKS, 2u) - 1;
+			growth_rate = std::max<SQInteger>(days_between_town_growth * ::Ticks::DAY_TICKS, 2u) - 1;
 			break;
 	}
 
@@ -188,7 +188,7 @@
 
 	if (t->growth_rate == TOWN_GROWTH_RATE_NONE) return TOWN_GROWTH_NONE;
 
-	return RoundDivSU(t->growth_rate + 1, DAY_TICKS);
+	return RoundDivSU(t->growth_rate + 1, ::Ticks::DAY_TICKS);
 }
 
 /* static */ SQInteger ScriptTown::GetDistanceManhattanToTile(TownID town_id, TileIndex tile)

src/settings.cpp

@@ -45,7 +45,6 @@
 #include "fios.h"
 #include "fileio_func.h"
 #include "settings_cmd.h"
-#include "date_type.h"
 
 #include "table/strings.h"
 
@@ -1283,8 +1282,8 @@ void LoadFromConfig(bool startup)
 	/* Load basic settings only during bootstrap, load other settings not during bootstrap */
 	if (!startup) {
 		if (generic_version < IFV_LINKGRAPH_SECONDS) {
-			_settings_newgame.linkgraph.recalc_interval *= SECONDS_PER_DAY;
+			_settings_newgame.linkgraph.recalc_interval *= CalendarTime::SECONDS_PER_DAY;
-			_settings_newgame.linkgraph.recalc_time     *= SECONDS_PER_DAY;
+			_settings_newgame.linkgraph.recalc_time     *= CalendarTime::SECONDS_PER_DAY;
 		}
 
 		/* Move no_http_content_downloads and use_relay_service from generic_ini to private_ini. */

src/settings_gui.cpp

@@ -2751,7 +2751,7 @@ struct CustomCurrencyWindow : Window {
 		this->SetWidgetDisabledState(WID_CC_RATE_DOWN, _custom_currency.rate == 1);
 		this->SetWidgetDisabledState(WID_CC_RATE_UP, _custom_currency.rate == UINT16_MAX);
 		this->SetWidgetDisabledState(WID_CC_YEAR_DOWN, _custom_currency.to_euro == CF_NOEURO);
-		this->SetWidgetDisabledState(WID_CC_YEAR_UP, _custom_currency.to_euro == MAX_YEAR);
+		this->SetWidgetDisabledState(WID_CC_YEAR_UP, _custom_currency.to_euro == CalendarTime::MAX_YEAR);
 	}
 
 	void SetStringParameters(int widget) const override
@@ -2850,8 +2850,8 @@ struct CustomCurrencyWindow : Window {
 				break;
 
 			case WID_CC_YEAR_UP:
-				_custom_currency.to_euro = Clamp(_custom_currency.to_euro + 1, MIN_EURO_YEAR, MAX_YEAR);
+				_custom_currency.to_euro = Clamp(_custom_currency.to_euro + 1, MIN_EURO_YEAR, CalendarTime::MAX_YEAR);
-				if (_custom_currency.to_euro == MAX_YEAR) this->DisableWidget(WID_CC_YEAR_UP);
+				if (_custom_currency.to_euro == CalendarTime::MAX_YEAR) this->DisableWidget(WID_CC_YEAR_UP);
 				this->EnableWidget(WID_CC_YEAR_DOWN);
 				break;
 
@@ -2897,7 +2897,7 @@ struct CustomCurrencyWindow : Window {
 			case WID_CC_YEAR: { // Year to switch to euro
 				TimerGameCalendar::Year val = atoi(str);
 
-				_custom_currency.to_euro = (val < MIN_EURO_YEAR ? CF_NOEURO : std::min(val, MAX_YEAR));
+				_custom_currency.to_euro = (val < MIN_EURO_YEAR ? CF_NOEURO : std::min(val, CalendarTime::MAX_YEAR));
 				break;
 			}
 		}

src/ship_cmd.cpp

@@ -236,7 +236,7 @@ void Ship::OnNewDay()
 
 	if (this->running_ticks == 0) return;
 
-	CommandCost cost(EXPENSES_SHIP_RUN, this->GetRunningCost() * this->running_ticks / (DAYS_IN_YEAR * DAY_TICKS));
+	CommandCost cost(EXPENSES_SHIP_RUN, this->GetRunningCost() * this->running_ticks / (CalendarTime::DAYS_IN_YEAR * Ticks::DAY_TICKS));
 
 	this->profit_this_year -= cost.GetCost();
 	this->running_ticks = 0;

src/sortlist_type.h

@@ -13,7 +13,7 @@
 #include "core/enum_type.hpp"
 #include "core/bitmath_func.hpp"
 #include "core/mem_func.hpp"
-#include "date_type.h"
+#include "timer/timer_game_tick.h"
 
 /** Flags of the sort list. */
 enum SortListFlags {
@@ -72,7 +72,7 @@ protected:
 	void ResetResortTimer()
 	{
 		/* Resort every 10 days */
-		this->resort_timer = DAY_TICKS * 10;
+		this->resort_timer = Ticks::DAY_TICKS * 10;
 	}
 
 public:

src/station.cpp

@@ -105,7 +105,7 @@ Station::~Station()
 		for (NodeID node = 0; node < lg->Size(); ++node) {
 			Station *st = Station::Get((*lg)[node].station);
 			st->goods[c].flows.erase(this->index);
-			if ((*lg)[node].HasEdgeTo(this->goods[c].node) && (*lg)[node][this->goods[c].node].LastUpdate() != INVALID_DATE) {
+			if ((*lg)[node].HasEdgeTo(this->goods[c].node) && (*lg)[node][this->goods[c].node].LastUpdate() != CalendarTime::INVALID_DATE) {
 				st->goods[c].flows.DeleteFlows(this->index);
 				RerouteCargo(st, c, this->index, st->index);
 			}

src/station_cmd.cpp

@@ -3863,11 +3863,11 @@ void DeleteStaleLinks(Station *from)
 					ge.flows.DeleteFlows(to->index);
 					RerouteCargo(from, c, to->index, from->index);
 				}
-			} else if (edge.last_unrestricted_update != INVALID_DATE && TimerGameCalendar::date - edge.last_unrestricted_update > timeout) {
+			} else if (edge.last_unrestricted_update != CalendarTime::INVALID_DATE && TimerGameCalendar::date - edge.last_unrestricted_update > timeout) {
 				edge.Restrict();
 				ge.flows.RestrictFlows(to->index);
 				RerouteCargo(from, c, to->index, from->index);
-			} else if (edge.last_restricted_update != INVALID_DATE && TimerGameCalendar::date - edge.last_restricted_update > timeout) {
+			} else if (edge.last_restricted_update != CalendarTime::INVALID_DATE && TimerGameCalendar::date - edge.last_restricted_update > timeout) {
 				edge.Release();
 			}
 		}
@@ -3964,7 +3964,7 @@ static void StationHandleSmallTick(BaseStation *st)
 	if ((st->facilities & FACIL_WAYPOINT) != 0 || !st->IsInUse()) return;
 
 	byte b = st->delete_ctr + 1;
-	if (b >= STATION_RATING_TICKS) b = 0;
+	if (b >= Ticks::STATION_RATING_TICKS) b = 0;
 	st->delete_ctr = b;
 
 	if (b == 0) UpdateStationRating(Station::From(st));
@@ -3978,18 +3978,18 @@ void OnTick_Station()
 		StationHandleSmallTick(st);
 
 		/* Clean up the link graph about once a week. */
-		if (Station::IsExpected(st) && (TimerGameTick::counter + st->index) % STATION_LINKGRAPH_TICKS == 0) {
+		if (Station::IsExpected(st) && (TimerGameTick::counter + st->index) % Ticks::STATION_LINKGRAPH_TICKS == 0) {
 			DeleteStaleLinks(Station::From(st));
 		};
 
 		/* Spread out big-tick over STATION_ACCEPTANCE_TICKS ticks. */
-		if ((TimerGameTick::counter + st->index) % STATION_ACCEPTANCE_TICKS == 0) {
+		if ((TimerGameTick::counter + st->index) % Ticks::STATION_ACCEPTANCE_TICKS == 0) {
 			/* Stop processing this station if it was deleted */
 			if (!StationHandleBigTick(st)) continue;
 		}
 
 		/* Spread out station animation over STATION_ACCEPTANCE_TICKS ticks. */
-		if ((TimerGameTick::counter + st->index) % STATION_ACCEPTANCE_TICKS == 0) {
+		if ((TimerGameTick::counter + st->index) % Ticks::STATION_ACCEPTANCE_TICKS == 0) {
 			TriggerStationAnimation(st, st->xy, SAT_250_TICKS);
 			TriggerRoadStopAnimation(st, st->xy, SAT_250_TICKS);
 			if (Station::IsExpected(st)) AirportAnimationTrigger(Station::From(st), AAT_STATION_250_TICKS);

src/statusbar_gui.cpp

@@ -25,7 +25,6 @@
 #include "toolbar_gui.h"
 #include "core/geometry_func.hpp"
 #include "zoom_func.h"
-#include "date_type.h"
 #include "timer/timer.h"
 #include "timer/timer_game_calendar.h"
 #include "timer/timer_window.h"
@@ -89,7 +88,7 @@ struct StatusBarWindow : Window {
 		Dimension d;
 		switch (widget) {
 			case WID_S_LEFT:
-				SetDParamMaxValue(0, DateAtStartOfYear(MAX_YEAR));
+				SetDParamMaxValue(0, TimerGameCalendar::DateAtStartOfYear(CalendarTime::MAX_YEAR));
 				d = GetStringBoundingBox(STR_JUST_DATE_LONG);
 				break;
 

src/story_cmd.h

@@ -12,7 +12,6 @@
 
 #include "command_type.h"
 #include "company_type.h"
-#include "date_type.h"
 #include "story_type.h"
 #include "vehicle_type.h"
 

src/story_gui.cpp

@@ -699,7 +699,7 @@ public:
 		int y_offset = -scrollpos;
 
 		/* Date */
-		if (page->date != INVALID_DATE) {
+		if (page->date != CalendarTime::INVALID_DATE) {
 			SetDParam(0, page->date);
 			DrawString(0, fr.right, y_offset, STR_JUST_DATE_LONG, TC_BLACK);
 		}

src/subsidy.cpp

@@ -45,7 +45,7 @@ void Subsidy::AwardTo(CompanyID company)
 	assert(!this->IsAwarded());
 
 	this->awarded = company;
-	this->remaining = _settings_game.difficulty.subsidy_duration * MONTHS_IN_YEAR;
+	this->remaining = _settings_game.difficulty.subsidy_duration * CalendarTime::MONTHS_IN_YEAR;
 
 	SetDParam(0, company);
 	NewsStringData *company_name = new NewsStringData(GetString(STR_COMPANY_NAME));

src/table/airport_defaults.h

@@ -10,7 +10,7 @@
 #ifndef AIRPORT_DEFAULTS_H
 #define AIRPORT_DEFAULTS_H
 
-#include "date_type.h"
+#include "timer/timer_game_calendar.h"
 
 /**
  * Definition of an airport tiles layout.
@@ -397,20 +397,20 @@ static const Direction _default_airports_rotation[] = {
 /* The helidepot and helistation have ATP_TTDP_SMALL because they are at ground level */
 extern const AirportSpec _origin_airport_specs[] = {
 	AS(country,          4, 3,     0,     1959,  4,  3,  7, ATP_TTDP_SMALL,    APC_SMALL,    STR_AIRPORT_SMALL,            SPR_AIRPORT_PREVIEW_SMALL),
-	AS(city,             6, 6,  1955, MAX_YEAR,  5,  5, 24, ATP_TTDP_LARGE,    APC_LARGE,    STR_AIRPORT_CITY,             SPR_AIRPORT_PREVIEW_LARGE),
+	AS(city,             6, 6,  1955, CalendarTime::MAX_YEAR,  5,  5, 24, ATP_TTDP_LARGE,    APC_LARGE,    STR_AIRPORT_CITY,             SPR_AIRPORT_PREVIEW_LARGE),
-	AS_ND(heliport,      1, 1,  1963, MAX_YEAR,  4,  1,  4, ATP_TTDP_HELIPORT, APC_HELIPORT, STR_AIRPORT_HELIPORT,         SPR_AIRPORT_PREVIEW_HELIPORT),
+	AS_ND(heliport,      1, 1,  1963, CalendarTime::MAX_YEAR,  4,  1,  4, ATP_TTDP_HELIPORT, APC_HELIPORT, STR_AIRPORT_HELIPORT,         SPR_AIRPORT_PREVIEW_HELIPORT),
-	AS(metropolitan,     6, 6,  1980, MAX_YEAR,  6,  8, 28, ATP_TTDP_LARGE,    APC_LARGE,    STR_AIRPORT_METRO,            SPR_AIRPORT_PREVIEW_METROPOLITAN),
+	AS(metropolitan,     6, 6,  1980, CalendarTime::MAX_YEAR,  6,  8, 28, ATP_TTDP_LARGE,    APC_LARGE,    STR_AIRPORT_METRO,            SPR_AIRPORT_PREVIEW_METROPOLITAN),
-	AS(international,    7, 7,  1990, MAX_YEAR,  8, 17, 42, ATP_TTDP_LARGE,    APC_HUB,      STR_AIRPORT_INTERNATIONAL,    SPR_AIRPORT_PREVIEW_INTERNATIONAL),
+	AS(international,    7, 7,  1990, CalendarTime::MAX_YEAR,  8, 17, 42, ATP_TTDP_LARGE,    APC_HUB,      STR_AIRPORT_INTERNATIONAL,    SPR_AIRPORT_PREVIEW_INTERNATIONAL),
-	AS(commuter,         5, 4,  1983, MAX_YEAR,  4,  4, 20, ATP_TTDP_SMALL,    APC_SMALL,    STR_AIRPORT_COMMUTER,         SPR_AIRPORT_PREVIEW_COMMUTER),
+	AS(commuter,         5, 4,  1983, CalendarTime::MAX_YEAR,  4,  4, 20, ATP_TTDP_SMALL,    APC_SMALL,    STR_AIRPORT_COMMUTER,         SPR_AIRPORT_PREVIEW_COMMUTER),
-	AS(helidepot,        2, 2,  1976, MAX_YEAR,  4,  2,  7, ATP_TTDP_SMALL,    APC_HELIPORT, STR_AIRPORT_HELIDEPOT,        SPR_AIRPORT_PREVIEW_HELIDEPOT),
+	AS(helidepot,        2, 2,  1976, CalendarTime::MAX_YEAR,  4,  2,  7, ATP_TTDP_SMALL,    APC_HELIPORT, STR_AIRPORT_HELIDEPOT,        SPR_AIRPORT_PREVIEW_HELIDEPOT),
-	AS(intercontinental, 9, 11, 2002, MAX_YEAR, 10, 25, 72, ATP_TTDP_LARGE,    APC_HUB,      STR_AIRPORT_INTERCONTINENTAL, SPR_AIRPORT_PREVIEW_INTERCONTINENTAL),
+	AS(intercontinental, 9, 11, 2002, CalendarTime::MAX_YEAR, 10, 25, 72, ATP_TTDP_LARGE,    APC_HUB,      STR_AIRPORT_INTERCONTINENTAL, SPR_AIRPORT_PREVIEW_INTERCONTINENTAL),
-	AS(helistation,      4, 2,  1980, MAX_YEAR,  4,  3, 14, ATP_TTDP_SMALL,    APC_HELIPORT, STR_AIRPORT_HELISTATION,      SPR_AIRPORT_PREVIEW_HELISTATION),
+	AS(helistation,      4, 2,  1980, CalendarTime::MAX_YEAR,  4,  3, 14, ATP_TTDP_SMALL,    APC_HELIPORT, STR_AIRPORT_HELISTATION,      SPR_AIRPORT_PREVIEW_HELISTATION),
 	AS_GENERIC(&_airportfta_oilrig, nullptr, _default_airports_rotation, 0, nullptr, 0, 1, 1, 0, 4, 0, 0, 0, ATP_TTDP_OILRIG, APC_HELIPORT, STR_NULL, 0, false),
 };
 
 static_assert(NEW_AIRPORT_OFFSET == lengthof(_origin_airport_specs));
 
-const AirportSpec AirportSpec::dummy = AS_GENERIC(&_airportfta_dummy, nullptr, _default_airports_rotation, 0, nullptr, 0, 0, 0, 0, 0, MIN_YEAR, MIN_YEAR, 0, ATP_TTDP_LARGE, APC_BEGIN, STR_NULL, 0, false);
+const AirportSpec AirportSpec::dummy = AS_GENERIC(&_airportfta_dummy, nullptr, _default_airports_rotation, 0, nullptr, 0, 0, 0, 0, 0, CalendarTime::MIN_YEAR, CalendarTime::MIN_YEAR, 0, ATP_TTDP_LARGE, APC_BEGIN, STR_NULL, 0, false);
 
 #undef AS
 #undef AS_ND

src/table/engines.h

@@ -24,7 +24,7 @@
  * @param f Bitmask of the climates
  * @note the 5 between b and f is the load amount
  */
-#define MT(a, b, c, d, e, f) { DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 5, f, e, 0, 8, 0, 0, 0, STR_EMPTY, CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
+#define MT(a, b, c, d, e, f) { CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 5, f, e, 0, 8, 0, 0, 0, STR_EMPTY, Ticks::CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
 
 /**
  * Writes the properties of a multiple-unit train into the EngineInfo struct.
@@ -37,7 +37,7 @@
  * @param f Bitmask of the climates
  * @note the 5 between b and f is the load amount
  */
-#define MM(a, b, c, d, e, f) { DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 5, f, e, 0, 8, 1 << EF_RAIL_IS_MU, 0, 0, STR_EMPTY, CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
+#define MM(a, b, c, d, e, f) { CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 5, f, e, 0, 8, 1 << EF_RAIL_IS_MU, 0, 0, STR_EMPTY, Ticks::CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
 
 /**
  * Writes the properties of a train carriage into the EngineInfo struct.
@@ -50,7 +50,7 @@
  * @see MT
  * @note the 5 between b and f is the load amount
  */
-#define MW(a, b, c, d, e, f) { DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 5, f, e, 0, 8, 0, 0, 0, STR_EMPTY, CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
+#define MW(a, b, c, d, e, f) { CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 5, f, e, 0, 8, 0, 0, 0, STR_EMPTY, Ticks::CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
 
 /**
  * Writes the properties of a road vehicle into the EngineInfo struct.
@@ -63,7 +63,7 @@
  * @param f Bitmask of the climates
  * @note the 5 between b and f is the load amount
  */
-#define MR(a, b, c, d, e, f) { DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 5, f, e, 0, 8, 0, 0, 0, STR_EMPTY, CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
+#define MR(a, b, c, d, e, f) { CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 5, f, e, 0, 8, 0, 0, 0, STR_EMPTY, Ticks::CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
 
 /**
  * Writes the properties of a ship into the EngineInfo struct.
@@ -75,7 +75,7 @@
  * @param f Bitmask of the climates
  * @note the 10 between b and f is the load amount
  */
-#define MS(a, b, c, d, e, f) { DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 10, f, e, 0, 8, 0, 0, 0, STR_EMPTY, CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
+#define MS(a, b, c, d, e, f) { CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 10, f, e, 0, 8, 0, 0, 0, STR_EMPTY, Ticks::CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
 
 /**
  * Writes the properties of an aeroplane into the EngineInfo struct.
@@ -86,7 +86,7 @@
  * @param e Bitmask of the climates
  * @note the 20 between b and e is the load amount
  */
-#define MA(a, b, c, d, e) { DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 20, e, CT_INVALID, 0, 8, 0, 0, 0, STR_EMPTY, CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
+#define MA(a, b, c, d, e) { CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR + a, c, d, b, 20, e, CT_INVALID, 0, 8, 0, 0, 0, STR_EMPTY, Ticks::CARGO_AGING_TICKS, INVALID_ENGINE, ExtraEngineFlags::None }
 
 /* Climates
  * T = Temperate

src/table/object_land.h

@@ -121,7 +121,7 @@ static const DrawTileSprites _object_hq[] = {
 
 #undef TILE_SPRITE_LINE
 
-#define M(name, size, build_cost_multiplier, clear_cost_multiplier, height, climate, gen_amount, flags) { GRFFilePropsBase<2>(), {0, 0, 0, 0}, INVALID_OBJECT_CLASS, name, climate, size, build_cost_multiplier, clear_cost_multiplier, 0, MAX_DATE + 1, flags, 0, height, 1, gen_amount }
+#define M(name, size, build_cost_multiplier, clear_cost_multiplier, height, climate, gen_amount, flags) { GRFFilePropsBase<2>(), {0, 0, 0, 0}, INVALID_OBJECT_CLASS, name, climate, size, build_cost_multiplier, clear_cost_multiplier, 0, CalendarTime::MAX_DATE + 1, flags, 0, height, 1, gen_amount }
 
 /* Climates
  * T = Temperate

src/table/railtypes.h

@@ -99,7 +99,7 @@ static const RailtypeInfo _original_railtypes[] = {
 		0x0A,
 
 		/* introduction date */
-		INVALID_DATE,
+		CalendarTime::INVALID_DATE,
 
 		/* railtypes required for this to be introduced */
 		RAILTYPES_NONE,
@@ -200,7 +200,7 @@ static const RailtypeInfo _original_railtypes[] = {
 		0x0A,
 
 		/* introduction date */
-		INVALID_DATE,
+		CalendarTime::INVALID_DATE,
 
 		/* railtypes required for this to be introduced */
 		RAILTYPES_NONE,
@@ -297,7 +297,7 @@ static const RailtypeInfo _original_railtypes[] = {
 		0x0A,
 
 		/* introduction date */
-		INVALID_DATE,
+		CalendarTime::INVALID_DATE,
 
 		/* railtypes required for this to be introduced */
 		RAILTYPES_NONE,
@@ -394,7 +394,7 @@ static const RailtypeInfo _original_railtypes[] = {
 		0x0A,
 
 		/* introduction date */
-		INVALID_DATE,
+		CalendarTime::INVALID_DATE,
 
 		/* railtypes required for this to be introduced */
 		RAILTYPES_NONE,

src/table/roadtypes.h

@@ -82,7 +82,7 @@ static const RoadTypeInfo _original_roadtypes[] = {
 		0x01,
 
 		/* introduction date */
-		static_cast<int32_t>(MIN_YEAR),
+		static_cast<int32_t>(CalendarTime::MIN_YEAR),
 
 		/* roadtypes required for this to be introduced */
 		ROADTYPES_NONE,
@@ -162,7 +162,7 @@ static const RoadTypeInfo _original_roadtypes[] = {
 		0x01,
 
 		/* introduction date */
-		INVALID_DATE,
+		CalendarTime::INVALID_DATE,
 
 		/* roadtypes required for this to be introduced */
 		ROADTYPES_NONE,

src/table/settings/currency_settings.ini

@@ -50,8 +50,8 @@ cat      = SC_BASIC
 var      = to_euro
 type     = SLE_INT32
 def      = 0
-min      = MIN_YEAR
+min      = CalendarTime::MIN_YEAR
-max      = MAX_YEAR
+max      = CalendarTime::MAX_YEAR
 
 [SDT_SSTR]
 var      = prefix

src/table/settings/gui_settings.ini

@@ -496,8 +496,8 @@ var      = gui.coloured_news_year
 type     = SLE_INT32
 flags    = SF_NOT_IN_SAVE | SF_NO_NETWORK_SYNC
 def      = 2000
-min      = MIN_YEAR
+min      = CalendarTime::MIN_YEAR
-max      = MAX_YEAR
+max      = CalendarTime::MAX_YEAR
 interval = 1
 str      = STR_CONFIG_SETTING_COLOURED_NEWS_YEAR
 strhelp  = STR_CONFIG_SETTING_COLOURED_NEWS_YEAR_HELPTEXT
@@ -543,8 +543,8 @@ var      = gui.semaphore_build_before
 type     = SLE_INT32
 flags    = SF_NOT_IN_SAVE | SF_NO_NETWORK_SYNC
 def      = 1950
-min      = MIN_YEAR
+min      = CalendarTime::MIN_YEAR
-max      = MAX_YEAR
+max      = CalendarTime::MAX_YEAR
 interval = 1
 str      = STR_CONFIG_SETTING_SEMAPHORE_BUILD_BEFORE_DATE
 strhelp  = STR_CONFIG_SETTING_SEMAPHORE_BUILD_BEFORE_DATE_HELPTEXT

src/table/settings/network_settings.ini

@@ -237,8 +237,8 @@ var      = network.restart_game_year
 type     = SLE_INT32
 flags    = SF_NOT_IN_SAVE | SF_NO_NETWORK_SYNC | SF_GUI_0_IS_SPECIAL | SF_NETWORK_ONLY
 def      = 0
-min      = MIN_YEAR
+min      = CalendarTime::MIN_YEAR
-max      = MAX_YEAR
+max      = CalendarTime::MAX_YEAR
 interval = 1
 
 [SDTC_VAR]

src/table/settings/world_settings.ini

@@ -122,9 +122,9 @@ cat      = SC_BASIC
 [SDT_VAR]
 var      = game_creation.starting_year
 type     = SLE_INT32
-def      = DEF_START_YEAR
+def      = CalendarTime::DEF_START_YEAR
-min      = MIN_YEAR
+min      = CalendarTime::MIN_YEAR
-max      = MAX_YEAR
+max      = CalendarTime::MAX_YEAR
 interval = 1
 str      = STR_CONFIG_SETTING_STARTING_YEAR
 strval   = STR_JUST_INT
@@ -135,9 +135,9 @@ var      = game_creation.ending_year
 type     = SLE_INT32
 from     = SLV_ENDING_YEAR
 flags    = SF_GUI_0_IS_SPECIAL
-def      = DEF_END_YEAR
+def      = CalendarTime::DEF_END_YEAR
-min      = MIN_YEAR
+min      = CalendarTime::MIN_YEAR
-max      = MAX_YEAR - 1
+max      = CalendarTime::MAX_YEAR - 1
 interval = 1
 str      = STR_CONFIG_SETTING_ENDING_YEAR
 strhelp  = STR_CONFIG_SETTING_ENDING_YEAR_HELPTEXT

src/table/town_land.h

@@ -1821,7 +1821,7 @@ static const HouseSpec _original_house_specs[] = {
 	 *                                                                              remove_rating_decrease
 	 *                                                                              |    mail_generation
 	 *     min_year                                                                 |    |    1st CargoID acceptance
-	 *     |         max_year                                                       |    |    |    2nd CargoID acceptance
+	 *     |         CalendarTime::MAX_YEAR                                                       |    |    |    2nd CargoID acceptance
 	 *     |         |    population                                                |    |    |    |    3th CargoID acceptance
 	 *     |         |    |    removal_cost                                         |    |    |    |    |
 	 *     |         |    |    |    building_name                                   |    |    |    |    |
@@ -1832,59 +1832,59 @@ static const HouseSpec _original_house_specs[] = {
 	 * +-cargoID accepted |    |    |                                               |    |    |    |    |
 	 * |   |         |    |    |    |                                               |    |    |    |    |
 	 */
-	MS(1963, MAX_YEAR, 187, 150, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      140,  70,   8,   3,   4,
+	MS(1963, CalendarTime::MAX_YEAR, 187, 150, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      140,  70,   8,   3,   4,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 00
-	MS(1957, MAX_YEAR,  85, 140, STR_TOWN_BUILDING_NAME_OFFICE_BLOCK_1,           130,  55,   8,   3,   4,
+	MS(1957, CalendarTime::MAX_YEAR,  85, 140, STR_TOWN_BUILDING_NAME_OFFICE_BLOCK_1,           130,  55,   8,   3,   4,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 01
-	MS(1968, MAX_YEAR,  40, 100, STR_TOWN_BUILDING_NAME_SMALL_BLOCK_OF_FLATS_1,    90,  20,   8,   3,   1,
+	MS(1968, CalendarTime::MAX_YEAR,  40, 100, STR_TOWN_BUILDING_NAME_SMALL_BLOCK_OF_FLATS_1,    90,  20,   8,   3,   1,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON4 | HZ_ZON3 | HZ_ZON2,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 02
-	MS(   0, MAX_YEAR,   5,  90, STR_TOWN_BUILDING_NAME_CHURCH_1,                 230,   2,   2,   0,   0,
+	MS(   0, CalendarTime::MAX_YEAR,   5,  90, STR_TOWN_BUILDING_NAME_CHURCH_1,                 230,   2,   2,   0,   0,
 	   BUILDING_IS_CHURCH | TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 03
-	MS(1975, MAX_YEAR, 220, 160, STR_TOWN_BUILDING_NAME_LARGE_OFFICE_BLOCK_1,     160,  85,  10,   4,   6,
+	MS(1975, CalendarTime::MAX_YEAR, 220, 160, STR_TOWN_BUILDING_NAME_LARGE_OFFICE_BLOCK_1,     160,  85,  10,   4,   6,
 	   BUILDING_IS_ANIMATED | TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_SUBARTC_BELOW | HZ_SUBTROPIC | HZ_ZON5,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 04
-	MS(1975, MAX_YEAR, 220, 160, STR_TOWN_BUILDING_NAME_LARGE_OFFICE_BLOCK_1,     160,  85,  10,   4,   6,
+	MS(1975, CalendarTime::MAX_YEAR, 220, 160, STR_TOWN_BUILDING_NAME_LARGE_OFFICE_BLOCK_1,     160,  85,  10,   4,   6,
 	   BUILDING_IS_ANIMATED | TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE  | HZ_ZON5,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 05
-	MS(   0, MAX_YEAR,  30,  80, STR_TOWN_BUILDING_NAME_TOWN_HOUSES_1,             80,  12,   4,   1,   0,
+	MS(   0, CalendarTime::MAX_YEAR,  30,  80, STR_TOWN_BUILDING_NAME_TOWN_HOUSES_1,             80,  12,   4,   1,   0,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 06
-	MS(1959, MAX_YEAR, 140, 180, STR_TOWN_BUILDING_NAME_HOTEL_1,                  150,  22,   6,   1,   2,
+	MS(1959, CalendarTime::MAX_YEAR, 140, 180, STR_TOWN_BUILDING_NAME_HOTEL_1,                  150,  22,   6,   1,   2,
 	   TILE_SIZE_1x2,
 	   HZ_TEMP | HZ_ZON5 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 07
-	MS(1959, MAX_YEAR,   0, 180, STR_TOWN_BUILDING_NAME_HOTEL_1,                  150,  22,   6,   1,   2,
+	MS(1959, CalendarTime::MAX_YEAR,   0, 180, STR_TOWN_BUILDING_NAME_HOTEL_1,                  150,  22,   6,   1,   2,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 08
-	MS(1945, MAX_YEAR,   0,  65, STR_TOWN_BUILDING_NAME_STATUE_1,                  40,   0,   2,   0,   0,
+	MS(1945, CalendarTime::MAX_YEAR,   0,  65, STR_TOWN_BUILDING_NAME_STATUE_1,                  40,   0,   2,   0,   0,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_SUBARTC_BELOW | HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 09
-	MS(1945, MAX_YEAR,   0,  65, STR_TOWN_BUILDING_NAME_FOUNTAIN_1,                40,   0,   2,   0,   0,
+	MS(1945, CalendarTime::MAX_YEAR,   0,  65, STR_TOWN_BUILDING_NAME_FOUNTAIN_1,                40,   0,   2,   0,   0,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_SUBARTC_BELOW | HZ_SUBTROPIC | HZ_ZON5,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 0A
-	MS(   0, MAX_YEAR,   0,  60, STR_TOWN_BUILDING_NAME_PARK_1,                    75,   0,   2,   0,   0,
+	MS(   0, CalendarTime::MAX_YEAR,   0,  60, STR_TOWN_BUILDING_NAME_PARK_1,                    75,   0,   2,   0,   0,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 0B
-	MS(1935, MAX_YEAR,   0,  60, STR_TOWN_BUILDING_NAME_PARK_1,                    75,   0,   2,   0,   0,
+	MS(1935, CalendarTime::MAX_YEAR,   0,  60, STR_TOWN_BUILDING_NAME_PARK_1,                    75,   0,   2,   0,   0,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 0C
-	MS(1951, MAX_YEAR, 150, 130, STR_TOWN_BUILDING_NAME_OFFICE_BLOCK_2,           110,  65,   8,   2,   4,
+	MS(1951, CalendarTime::MAX_YEAR, 150, 130, STR_TOWN_BUILDING_NAME_OFFICE_BLOCK_2,           110,  65,   8,   2,   4,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 0D
@@ -1900,31 +1900,31 @@ static const HouseSpec _original_house_specs[] = {
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 10
-	MS(1977, MAX_YEAR, 130, 200, STR_TOWN_BUILDING_NAME_MODERN_OFFICE_BUILDING_1, 150,  50,  10,   3,   6,
+	MS(1977, CalendarTime::MAX_YEAR, 130, 200, STR_TOWN_BUILDING_NAME_MODERN_OFFICE_BUILDING_1, 150,  50,  10,   3,   6,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_SUBARTC_BELOW | HZ_SUBTROPIC | HZ_ZON5,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 11
-	MS(1983, MAX_YEAR,   6, 145, STR_TOWN_BUILDING_NAME_WAREHOUSE_1,              110,  10,   6,   3,   8,
+	MS(1983, CalendarTime::MAX_YEAR,   6, 145, STR_TOWN_BUILDING_NAME_WAREHOUSE_1,              110,  10,   6,   3,   8,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 12
-	MS(1985, MAX_YEAR, 110, 155, STR_TOWN_BUILDING_NAME_OFFICE_BLOCK_3,           110,  55,   6,   2,   6,
+	MS(1985, CalendarTime::MAX_YEAR, 110, 155, STR_TOWN_BUILDING_NAME_OFFICE_BLOCK_3,           110,  55,   6,   2,   6,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 13
-	MS(   0, MAX_YEAR,  65, 250, STR_TOWN_BUILDING_NAME_STADIUM_1,                300,   5,   4,   0,   0,
+	MS(   0, CalendarTime::MAX_YEAR,  65, 250, STR_TOWN_BUILDING_NAME_STADIUM_1,                300,   5,   4,   0,   0,
 	   BUILDING_IS_STADIUM | TILE_SIZE_2x2,
 	   HZ_TEMP | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 14
-	MS(   0, MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_1,                300,   5,   4,   0,   0,
+	MS(   0, CalendarTime::MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_1,                300,   5,   4,   0,   0,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 15
-	MS(   0, MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_1,                300,   5,   4,   0,   0,
+	MS(   0, CalendarTime::MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_1,                300,   5,   4,   0,   0,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 16
-	MS(   0, MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_1,                300,   5,   4,   0,   0,
+	MS(   0, CalendarTime::MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_1,                300,   5,   4,   0,   0,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 17
@@ -1936,15 +1936,15 @@ static const HouseSpec _original_house_specs[] = {
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 19
-	MS(1931, MAX_YEAR,  13,  71, STR_TOWN_BUILDING_NAME_HOUSES_1,                  75,   8,   3,   1,   0,
+	MS(1931, CalendarTime::MAX_YEAR,  13,  71, STR_TOWN_BUILDING_NAME_HOUSES_1,                  75,   8,   3,   1,   0,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 1A
-	MS(1935, MAX_YEAR, 100, 135, STR_TOWN_BUILDING_NAME_FLATS_1,                  100,  35,   7,   2,   2,
+	MS(1935, CalendarTime::MAX_YEAR, 100, 135, STR_TOWN_BUILDING_NAME_FLATS_1,                  100,  35,   7,   2,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 1B
-	MS(1963, MAX_YEAR, 170, 145, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_2,      170,  50,   8,   3,   3,
+	MS(1963, CalendarTime::MAX_YEAR, 170, 145, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_2,      170,  50,   8,   3,   3,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 1C
@@ -1952,31 +1952,31 @@ static const HouseSpec _original_house_specs[] = {
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 1D
-	MS(1973, MAX_YEAR, 180, 155, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_3,      180,  64,   8,   3,   3,
+	MS(1973, CalendarTime::MAX_YEAR, 180, 155, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_3,      180,  64,   8,   3,   3,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 1E
-	MS(   0, MAX_YEAR,  35, 220, STR_TOWN_BUILDING_NAME_THEATER_1,                230,  23,   8,   2,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  35, 220, STR_TOWN_BUILDING_NAME_THEATER_1,                230,  23,   8,   2,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 1F
-	MS(1958, MAX_YEAR,  65, 250, STR_TOWN_BUILDING_NAME_STADIUM_2,                300,   5,   4,   0,   0,
+	MS(1958, CalendarTime::MAX_YEAR,  65, 250, STR_TOWN_BUILDING_NAME_STADIUM_2,                300,   5,   4,   0,   0,
 	   BUILDING_IS_STADIUM | TILE_SIZE_2x2,
 	   HZ_TEMP | HZ_SUBARTC_BELOW | HZ_SUBTROPIC | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 20
-	MS(1958, MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_2,                300,   5,   4,   0,   0,
+	MS(1958, CalendarTime::MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_2,                300,   5,   4,   0,   0,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 21
-	MS(1958, MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_2,                300,   5,   4,   0,   0,
+	MS(1958, CalendarTime::MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_2,                300,   5,   4,   0,   0,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 22
-	MS(1958, MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_2,                300,   5,   4,   0,   0,
+	MS(1958, CalendarTime::MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_STADIUM_2,                300,   5,   4,   0,   0,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 23
-	MS(2000, MAX_YEAR, 140, 170, STR_TOWN_BUILDING_NAME_OFFICES_1,                250,  65,   8,   3,   2,
+	MS(2000, CalendarTime::MAX_YEAR, 140, 170, STR_TOWN_BUILDING_NAME_OFFICES_1,                250,  65,   8,   3,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_SUBARTC_BELOW | HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 24
@@ -1988,39 +1988,39 @@ static const HouseSpec _original_house_specs[] = {
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 26
-	MS(1945, MAX_YEAR,  35, 210, STR_TOWN_BUILDING_NAME_CINEMA_1,                 230,  23,   8,   2,   2,
+	MS(1945, CalendarTime::MAX_YEAR,  35, 210, STR_TOWN_BUILDING_NAME_CINEMA_1,                 230,  23,   8,   2,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TEMP | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 27
-	MS(1983, MAX_YEAR, 180, 250, STR_TOWN_BUILDING_NAME_SHOPPING_MALL_1,          300,   5,   8,   2,   3,
+	MS(1983, CalendarTime::MAX_YEAR, 180, 250, STR_TOWN_BUILDING_NAME_SHOPPING_MALL_1,          300,   5,   8,   2,   3,
 	   TILE_SIZE_2x2,
 	   HZ_TEMP | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 |HZ_ZON2,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 28
-	MS(1983, MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_SHOPPING_MALL_1,          300,   5,   8,   2,   3,
+	MS(1983, CalendarTime::MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_SHOPPING_MALL_1,          300,   5,   8,   2,   3,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 29
-	MS(1983, MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_SHOPPING_MALL_1,          300,   5,   8,   2,   3,
+	MS(1983, CalendarTime::MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_SHOPPING_MALL_1,          300,   5,   8,   2,   3,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 2A
-	MS(1983, MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_SHOPPING_MALL_1,          300,   5,   8,   2,   3,
+	MS(1983, CalendarTime::MAX_YEAR,   0, 250, STR_TOWN_BUILDING_NAME_SHOPPING_MALL_1,          300,   5,   8,   2,   3,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 2B
-	MS(   0, MAX_YEAR,  80, 100, STR_TOWN_BUILDING_NAME_FLATS_1,                   90,  20,   5,   2,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  80, 100, STR_TOWN_BUILDING_NAME_FLATS_1,                   90,  20,   5,   2,   2,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 2C
-	MS(   0, MAX_YEAR,  80, 100, STR_TOWN_BUILDING_NAME_FLATS_1,                   90,  20,   5,   2,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  80, 100, STR_TOWN_BUILDING_NAME_FLATS_1,                   90,  20,   5,   2,   2,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE  | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 2D
-	MS(   0, MAX_YEAR,  16,  70, STR_TOWN_BUILDING_NAME_HOUSES_2,                  70,   6,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  16,  70, STR_TOWN_BUILDING_NAME_HOUSES_2,                  70,   6,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 2E
-	MS(   0, MAX_YEAR,  16,  70, STR_TOWN_BUILDING_NAME_HOUSES_2,                  70,   6,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  16,  70, STR_TOWN_BUILDING_NAME_HOUSES_2,                  70,   6,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 2F
@@ -2032,59 +2032,59 @@ static const HouseSpec _original_house_specs[] = {
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 31
-	MS(1966, MAX_YEAR, 135, 150, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      120,  60,   8,   3,   4,
+	MS(1966, CalendarTime::MAX_YEAR, 135, 150, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      120,  60,   8,   3,   4,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 32
-	MS(1966, MAX_YEAR, 135, 150, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      120,  60,   8,   3,   4,
+	MS(1966, CalendarTime::MAX_YEAR, 135, 150, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      120,  60,   8,   3,   4,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 33
-	MS(1970, MAX_YEAR, 170, 170, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      130,  70,   9,   3,   4,
+	MS(1970, CalendarTime::MAX_YEAR, 170, 170, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      130,  70,   9,   3,   4,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 34
-	MS(1970, MAX_YEAR, 170, 170, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      130,  70,   9,   3,   4,
+	MS(1970, CalendarTime::MAX_YEAR, 170, 170, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      130,  70,   9,   3,   4,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 35
-	MS(1974, MAX_YEAR, 210, 200, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      140,  80,  10,   3,   5,
+	MS(1974, CalendarTime::MAX_YEAR, 210, 200, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      140,  80,  10,   3,   5,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 36
-	MS(1974, MAX_YEAR, 210, 200, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      140,  80,  10,   3,   5,
+	MS(1974, CalendarTime::MAX_YEAR, 210, 200, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      140,  80,  10,   3,   5,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 37
-	MS(   0, MAX_YEAR,  10,  60, STR_TOWN_BUILDING_NAME_HOUSES_2,                  60,   5,   2,   1,   1,
+	MS(   0, CalendarTime::MAX_YEAR,  10,  60, STR_TOWN_BUILDING_NAME_HOUSES_2,                  60,   5,   2,   1,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 38
-	MS(   0, MAX_YEAR,  10,  60, STR_TOWN_BUILDING_NAME_HOUSES_2,                  60,   5,   2,   1,   1,
+	MS(   0, CalendarTime::MAX_YEAR,  10,  60, STR_TOWN_BUILDING_NAME_HOUSES_2,                  60,   5,   2,   1,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 39
-	MS(   0, MAX_YEAR,  25, 100, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,       80,  20,   3,   1,   1,
+	MS(   0, CalendarTime::MAX_YEAR,  25, 100, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,       80,  20,   3,   1,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 3A
-	MS(   0, MAX_YEAR,  25, 100, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,       80,  20,   3,   1,   1,
+	MS(   0, CalendarTime::MAX_YEAR,  25, 100, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,       80,  20,   3,   1,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 3B
-	MS(   0, MAX_YEAR,   6,  85, STR_TOWN_BUILDING_NAME_CHURCH_1,                 230,   2,   2,   0,   0,
+	MS(   0, CalendarTime::MAX_YEAR,   6,  85, STR_TOWN_BUILDING_NAME_CHURCH_1,                 230,   2,   2,   0,   0,
 	   BUILDING_IS_CHURCH | TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 3C
-	MS(   0, MAX_YEAR,   6,  85, STR_TOWN_BUILDING_NAME_CHURCH_1,                 230,   2,   2,   0,   0,
+	MS(   0, CalendarTime::MAX_YEAR,   6,  85, STR_TOWN_BUILDING_NAME_CHURCH_1,                 230,   2,   2,   0,   0,
 	   BUILDING_IS_CHURCH | TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 3D
-	MS(   0, MAX_YEAR,  17,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   7,   3,   1,   1,
+	MS(   0, CalendarTime::MAX_YEAR,  17,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   7,   3,   1,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 3E
-	MS(   0, MAX_YEAR,  17,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   7,   3,   1,   1,
+	MS(   0, CalendarTime::MAX_YEAR,  17,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   7,   3,   1,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 3F
@@ -2096,179 +2096,179 @@ static const HouseSpec _original_house_specs[] = {
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE| HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 41
-	MS(1972, MAX_YEAR, 140, 160, STR_TOWN_BUILDING_NAME_HOTEL_1,                  160,  25,   6,   1,   3,
+	MS(1972, CalendarTime::MAX_YEAR, 140, 160, STR_TOWN_BUILDING_NAME_HOTEL_1,                  160,  25,   6,   1,   3,
 	   TILE_SIZE_1x2,
 	   HZ_SUBARTC_BELOW| HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 42
-	MS(1972, MAX_YEAR,   0, 160, STR_TOWN_BUILDING_NAME_HOTEL_1,                  160,  25,   6,   1,   2,
+	MS(1972, CalendarTime::MAX_YEAR,   0, 160, STR_TOWN_BUILDING_NAME_HOTEL_1,                  160,  25,   6,   1,   2,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 43
-	MS(1972, MAX_YEAR, 140, 160, STR_TOWN_BUILDING_NAME_HOTEL_1,                  160,  25,   6,   1,   3,
+	MS(1972, CalendarTime::MAX_YEAR, 140, 160, STR_TOWN_BUILDING_NAME_HOTEL_1,                  160,  25,   6,   1,   3,
 	   TILE_SIZE_1x2,
 	   HZ_SUBARTC_ABOVE| HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 44
-	MS(1972, MAX_YEAR,   0, 160, STR_TOWN_BUILDING_NAME_HOTEL_1,                  160,  25,   6,   1,   2,
+	MS(1972, CalendarTime::MAX_YEAR,   0, 160, STR_TOWN_BUILDING_NAME_HOTEL_1,                  160,  25,   6,   1,   2,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 45
-	MS(1963, MAX_YEAR, 105, 130, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,      105,  50,   7,   2,   3,
+	MS(1963, CalendarTime::MAX_YEAR, 105, 130, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,      105,  50,   7,   2,   3,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 46
-	MS(1963, MAX_YEAR, 105, 130, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,      105,  50,   7,   2,   3,
+	MS(1963, CalendarTime::MAX_YEAR, 105, 130, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,      105,  50,   7,   2,   3,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE| HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 47
-	MS(1978, MAX_YEAR, 190, 190, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      135,  75,   9,   3,   4,
+	MS(1978, CalendarTime::MAX_YEAR, 190, 190, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      135,  75,   9,   3,   4,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_BELOW | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 48
-	MS(1978, MAX_YEAR, 190, 190, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      135,  75,   9,   3,   4,
+	MS(1978, CalendarTime::MAX_YEAR, 190, 190, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      135,  75,   9,   3,   4,
 	   TILE_SIZE_1x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 49
-	MS(1967, MAX_YEAR, 250, 140, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      200,  60,   7,   2,   2,
+	MS(1967, CalendarTime::MAX_YEAR, 250, 140, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      200,  60,   7,   2,   2,
 	   TILE_SIZE_2x1,
 	   HZ_SUBARTC_BELOW| HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 4A
-	MS(1967, MAX_YEAR,   0, 140, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      200,  60,   7,   2,   2,
+	MS(1967, CalendarTime::MAX_YEAR,   0, 140, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      200,  60,   7,   2,   2,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 4B
-	MS(1967, MAX_YEAR, 250, 140, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      200,  60,   7,   2,   2,
+	MS(1967, CalendarTime::MAX_YEAR, 250, 140, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      200,  60,   7,   2,   2,
 	   TILE_SIZE_2x1,
 	   HZ_SUBARTC_ABOVE | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 4C
-	MS(1967, MAX_YEAR,   0, 140, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      200,  60,   7,   2,   2,
+	MS(1967, CalendarTime::MAX_YEAR,   0, 140, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      200,  60,   7,   2,   2,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 4D
-	MS(   0, MAX_YEAR,  16,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   6,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  16,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   6,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 4E
-	MS(   0, MAX_YEAR,  16,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   6,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  16,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   6,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 4F
-	MS(   0, MAX_YEAR,  16,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   5,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  16,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   5,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 50
-	MS(   0, MAX_YEAR,   7,  30, STR_TOWN_BUILDING_NAME_HOUSES_2,                  30,   4,   3,   1,   1,
+	MS(   0, CalendarTime::MAX_YEAR,   7,  30, STR_TOWN_BUILDING_NAME_HOUSES_2,                  30,   4,   3,   1,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 51
-	MS(   0, MAX_YEAR,  45, 130, STR_TOWN_BUILDING_NAME_FLATS_1,                   95,  15,   6,   2,   1,
+	MS(   0, CalendarTime::MAX_YEAR,  45, 130, STR_TOWN_BUILDING_NAME_FLATS_1,                   95,  15,   6,   2,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 52
-	MS(   0, MAX_YEAR,   8,  90, STR_TOWN_BUILDING_NAME_CHURCH_1,                 200,   3,   2,   0,   0,
+	MS(   0, CalendarTime::MAX_YEAR,   8,  90, STR_TOWN_BUILDING_NAME_CHURCH_1,                 200,   3,   2,   0,   0,
 	   BUILDING_IS_CHURCH | TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON4 | HZ_ZON3 | HZ_ZON2,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 53
-	MS(   0, MAX_YEAR,  18,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   7,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  18,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   7,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2,
 	   CT_PASSENGERS, CT_MAIL, CT_FOOD), // 54
-	MS(1973, MAX_YEAR,  90, 110, STR_TOWN_BUILDING_NAME_FLATS_1,                   95,  24,   6,   2,   1,
+	MS(1973, CalendarTime::MAX_YEAR,  90, 110, STR_TOWN_BUILDING_NAME_FLATS_1,                   95,  24,   6,   2,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 55
-	MS(1962, MAX_YEAR, 120, 120, STR_TOWN_BUILDING_NAME_FLATS_1,                   95,  25,   6,   2,   1,
+	MS(1962, CalendarTime::MAX_YEAR, 120, 120, STR_TOWN_BUILDING_NAME_FLATS_1,                   95,  25,   6,   2,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 56
-	MS(1984, MAX_YEAR, 250, 190, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      140,  80,   8,   3,   4,
+	MS(1984, CalendarTime::MAX_YEAR, 250, 190, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      140,  80,   8,   3,   4,
 	   TILE_SIZE_2x1,
 	   HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 57
-	MS(1984, MAX_YEAR,   0, 190, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      140,  80,   8,   3,   4,
+	MS(1984, CalendarTime::MAX_YEAR,   0, 190, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      140,  80,   8,   3,   4,
 	   TILE_NO_FLAG,
 	   HZ_SUBTROPIC,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 58
-	MS(   0, MAX_YEAR,  80, 110, STR_TOWN_BUILDING_NAME_FLATS_1,                   95,  23,   6,   2,   1,
+	MS(   0, CalendarTime::MAX_YEAR,  80, 110, STR_TOWN_BUILDING_NAME_FLATS_1,                   95,  23,   6,   2,   1,
 	   TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 59
-	MS(1993, MAX_YEAR, 180, 180, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      150,  90,   8,   3,   4,
+	MS(1993, CalendarTime::MAX_YEAR, 180, 180, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      150,  90,   8,   3,   4,
 	   TILE_SIZE_1x1,
 	   HZ_SUBTROPIC | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_GOODS), // 5A
-	MS(   0, MAX_YEAR,   8,  90, STR_TOWN_BUILDING_NAME_CHURCH_1,                 200,   3,   2,   0,   0,
+	MS(   0, CalendarTime::MAX_YEAR,   8,  90, STR_TOWN_BUILDING_NAME_CHURCH_1,                 200,   3,   2,   0,   0,
 	   BUILDING_IS_CHURCH | TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 5B
-	MS(   0, MAX_YEAR,  18,  90, STR_TOWN_BUILDING_NAME_HOUSES_2,                  90,   5,   6,   2,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  18,  90, STR_TOWN_BUILDING_NAME_HOUSES_2,                  90,   5,   6,   2,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 5C
-	MS(   0, MAX_YEAR,   7,  70, STR_TOWN_BUILDING_NAME_HOUSES_2,                  50,   3,   3,   1,   1,
+	MS(   0, CalendarTime::MAX_YEAR,   7,  70, STR_TOWN_BUILDING_NAME_HOUSES_2,                  50,   3,   3,   1,   1,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 5D
-	MS(   0, MAX_YEAR,  15,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  75,   6,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  15,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  75,   6,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 5E
-	MS(   0, MAX_YEAR,  17,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  75,   6,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  17,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  75,   6,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 5F
-	MS(   0, MAX_YEAR,  19,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  75,   6,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  19,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  75,   6,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 60
-	MS(   0, MAX_YEAR,  21,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  75,   6,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  21,  80, STR_TOWN_BUILDING_NAME_HOUSES_2,                  75,   6,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 61
-	MS(   0, MAX_YEAR,  75, 160, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      130,  20,   8,   4,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  75, 160, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      130,  20,   8,   4,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 62
-	MS(   0, MAX_YEAR,  35,  90, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   9,   4,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  35,  90, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   9,   4,   1,   2,
 	   TILE_SIZE_1x2,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 63
-	MS(   0, MAX_YEAR,   0,  90, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   0,   4,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,   0,  90, STR_TOWN_BUILDING_NAME_HOUSES_2,                  80,   0,   4,   1,   2,
 	   TILE_NO_FLAG,
 	   HZ_NOZNS,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 64
-	MS(   0, MAX_YEAR,  85, 150, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      130,  18,   8,   4,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  85, 150, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      130,  18,   8,   4,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 65
-	MS(   0, MAX_YEAR,  11,  60, STR_TOWN_BUILDING_NAME_IGLOO_1,                   45,   3,   3,   1,   1,
+	MS(   0, CalendarTime::MAX_YEAR,  11,  60, STR_TOWN_BUILDING_NAME_IGLOO_1,                   45,   3,   3,   1,   1,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 66
-	MS(   0, MAX_YEAR,  10,  60, STR_TOWN_BUILDING_NAME_TEPEES_1,                  45,   3,   3,   1,   1,
+	MS(   0, CalendarTime::MAX_YEAR,  10,  60, STR_TOWN_BUILDING_NAME_TEPEES_1,                  45,   3,   3,   1,   1,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 67
-	MS(   0, MAX_YEAR,  67, 140, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,      130,  22,   8,   4,   4,
+	MS(   0, CalendarTime::MAX_YEAR,  67, 140, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,      130,  22,   8,   4,   4,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_FIZZY_DRINKS), // 68
-	MS(   0, MAX_YEAR,  86, 145, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,      130,  23,   8,   4,   4,
+	MS(   0, CalendarTime::MAX_YEAR,  86, 145, STR_TOWN_BUILDING_NAME_SHOPS_AND_OFFICES_1,      130,  23,   8,   4,   4,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_FIZZY_DRINKS), // 69
-	MS(   0, MAX_YEAR,  95, 165, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      130,  28,   8,   4,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  95, 165, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,      130,  28,   8,   4,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 6A
-	MS(   0, MAX_YEAR,  30,  90, STR_TOWN_BUILDING_NAME_STATUE_1,                  70,  10,   4,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  30,  90, STR_TOWN_BUILDING_NAME_STATUE_1,                  70,  10,   4,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 6B
-	MS(   0, MAX_YEAR,  25,  75, STR_TOWN_BUILDING_NAME_TEAPOT_HOUSE_1,            65,   8,   3,   1,   2,
+	MS(   0, CalendarTime::MAX_YEAR,  25,  75, STR_TOWN_BUILDING_NAME_TEAPOT_HOUSE_1,            65,   8,   3,   1,   2,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_CANDY), // 6C
-	MS(   0, MAX_YEAR,  18,  85, STR_TOWN_BUILDING_NAME_PIGGY_BANK_1,              95,   7,   3,   2,   4,
+	MS(   0, CalendarTime::MAX_YEAR,  18,  85, STR_TOWN_BUILDING_NAME_PIGGY_BANK_1,              95,   7,   3,   2,   4,
 	   TILE_SIZE_1x1,
 	   HZ_TOYLND | HZ_ZON5 | HZ_ZON4 | HZ_ZON3 | HZ_ZON2 | HZ_ZON1,
 	   CT_PASSENGERS, CT_MAIL, CT_FIZZY_DRINKS), // 6D

src/timer/timer_game_calendar.cpp

@@ -68,42 +68,42 @@ static const uint16_t _accum_days_for_month[] = {
  * @param date the date to convert from
  * @param ymd  the year, month and day to write to
  */
-/* static */ void TimerGameCalendar::ConvertDateToYMD(TimerGameCalendar::Date date, YearMonthDay *ymd)
+/* static */ void TimerGameCalendar::ConvertDateToYMD(TimerGameCalendar::Date date, TimerGameCalendar::YearMonthDay *ymd)
 {
 	/* Year determination in multiple steps to account for leap
 	 * years. First do the large steps, then the smaller ones.
 	 */
 
 	/* There are 97 leap years in 400 years */
-	TimerGameCalendar::Year yr = 400 * (static_cast<int32_t>(date) / (DAYS_IN_YEAR * 400 + 97));
+	TimerGameCalendar::Year yr = 400 * (static_cast<int32_t>(date) / (CalendarTime::DAYS_IN_YEAR * 400 + 97));
-	int rem = static_cast<int32_t>(date) % (DAYS_IN_YEAR * 400 + 97);
+	int rem = static_cast<int32_t>(date) % (CalendarTime::DAYS_IN_YEAR * 400 + 97);
 	uint16_t x;
 
-	if (rem >= DAYS_IN_YEAR * 100 + 25) {
+	if (rem >= CalendarTime::DAYS_IN_YEAR * 100 + 25) {
 		/* There are 25 leap years in the first 100 years after
 		 * every 400th year, as every 400th year is a leap year */
 		yr += 100;
-		rem -= DAYS_IN_YEAR * 100 + 25;
+		rem -= CalendarTime::DAYS_IN_YEAR * 100 + 25;
 
 		/* There are 24 leap years in the next couple of 100 years */
-		yr += 100 * (rem / (DAYS_IN_YEAR * 100 + 24));
+		yr += 100 * (rem / (CalendarTime::DAYS_IN_YEAR * 100 + 24));
-		rem = (rem % (DAYS_IN_YEAR * 100 + 24));
+		rem = (rem % (CalendarTime::DAYS_IN_YEAR * 100 + 24));
 	}
 
-	if (!TimerGameCalendar::IsLeapYear(yr) && rem >= DAYS_IN_YEAR * 4) {
+	if (!TimerGameCalendar::IsLeapYear(yr) && rem >= CalendarTime::DAYS_IN_YEAR * 4) {
 		/* The first 4 year of the century are not always a leap year */
 		yr += 4;
-		rem -= DAYS_IN_YEAR * 4;
+		rem -= CalendarTime::DAYS_IN_YEAR * 4;
 	}
 
 	/* There is 1 leap year every 4 years */
-	yr += 4 * (rem / (DAYS_IN_YEAR * 4 + 1));
+	yr += 4 * (rem / (CalendarTime::DAYS_IN_YEAR * 4 + 1));
-	rem = rem % (DAYS_IN_YEAR * 4 + 1);
+	rem = rem % (CalendarTime::DAYS_IN_YEAR * 4 + 1);
 
 	/* The last (max 3) years to account for; the first one
 	 * can be, but is not necessarily a leap year */
-	while (rem >= (TimerGameCalendar::IsLeapYear(yr) ? DAYS_IN_LEAP_YEAR : DAYS_IN_YEAR)) {
+	while (rem >= (TimerGameCalendar::IsLeapYear(yr) ? CalendarTime::DAYS_IN_LEAP_YEAR : CalendarTime::DAYS_IN_YEAR)) {
-		rem -= TimerGameCalendar::IsLeapYear(yr) ? DAYS_IN_LEAP_YEAR : DAYS_IN_YEAR;
+		rem -= TimerGameCalendar::IsLeapYear(yr) ? CalendarTime::DAYS_IN_LEAP_YEAR : CalendarTime::DAYS_IN_YEAR;
 		yr++;
 	}
 
@@ -131,7 +131,7 @@ static const uint16_t _accum_days_for_month[] = {
 	/* Account for the missing of the 29th of February in non-leap years */
 	if (!TimerGameCalendar::IsLeapYear(year) && days >= ACCUM_MAR) days--;
 
-	return DateAtStartOfYear(year) + days;
+	return TimerGameCalendar::DateAtStartOfYear(year) + days;
 }
 
 /**
@@ -151,9 +151,9 @@ static const uint16_t _accum_days_for_month[] = {
  */
 /* static */ void TimerGameCalendar::SetDate(TimerGameCalendar::Date date, TimerGameCalendar::DateFract fract)
 {
-	assert(fract < DAY_TICKS);
+	assert(fract < Ticks::DAY_TICKS);
 
-	YearMonthDay ymd;
+	TimerGameCalendar::YearMonthDay ymd;
 
 	TimerGameCalendar::date = date;
 	TimerGameCalendar::date_fract = fract;
@@ -189,7 +189,7 @@ void TimerManager<TimerGameCalendar>::Elapsed(TimerGameCalendar::TElapsed delta)
 	if (_game_mode == GM_MENU) return;
 
 	TimerGameCalendar::date_fract++;
-	if (TimerGameCalendar::date_fract < DAY_TICKS) return;
+	if (TimerGameCalendar::date_fract < Ticks::DAY_TICKS) return;
 	TimerGameCalendar::date_fract = 0;
 
 	/* increase day counter */
@@ -240,11 +240,11 @@ void TimerManager<TimerGameCalendar>::Elapsed(TimerGameCalendar::TElapsed delta)
 	}
 
 	/* check if we reached the maximum year, decrement dates by a year */
-	if (TimerGameCalendar::year == MAX_YEAR + 1) {
+	if (TimerGameCalendar::year == CalendarTime::MAX_YEAR + 1) {
 		int days_this_year;
 
 		TimerGameCalendar::year--;
-		days_this_year = TimerGameCalendar::IsLeapYear(TimerGameCalendar::year) ? DAYS_IN_LEAP_YEAR : DAYS_IN_YEAR;
+		days_this_year = TimerGameCalendar::IsLeapYear(TimerGameCalendar::year) ? CalendarTime::DAYS_IN_LEAP_YEAR : CalendarTime::DAYS_IN_YEAR;
 		TimerGameCalendar::date -= days_this_year;
 		for (Vehicle *v : Vehicle::Iterate()) v->ShiftDates(-days_this_year);
 		for (LinkGraph *lg : LinkGraph::Iterate()) lg->ShiftDates(-days_this_year);

src/timer/timer_game_calendar.h

@@ -33,6 +33,29 @@
  */
 class TimerGameCalendar {
 public:
+	/** The type to store our dates in. */
+	using Date = StrongType::Typedef<int32_t, struct DateTag, StrongType::Compare, StrongType::Integer>;
+
+	/** The fraction of a date we're in, i.e. the number of ticks since the last date changeover. */
+	using DateFract = uint16_t;
+
+	/** Type for the year, note: 0 based, i.e. starts at the year 0. */
+	using Year = StrongType::Typedef<int32_t, struct YearTag, StrongType::Compare, StrongType::Integer>;
+	/** Type for the month, note: 0 based, i.e. 0 = January, 11 = December. */
+	using Month = uint8_t;
+	/** Type for the day of the month, note: 1 based, first day of a month is 1. */
+	using Day = uint8_t;
+
+	/**
+	 * Data structure to convert between Date and triplet (year, month, and day).
+	 * @see TimerGameCalendar::ConvertDateToYMD(), TimerGameCalendar::ConvertYMDToDate()
+	 */
+	struct YearMonthDay {
+		Year  year;   ///< Year (0...)
+		Month month;  ///< Month (0..11)
+		Day   day;    ///< Day (1..31)
+	};
+
 	enum Trigger {
 		DAY,
 		WEEK,
@@ -77,33 +100,35 @@ public:
 	struct TStorage {
 	};
 
-	/** The type to store our dates in. */
+	static bool IsLeapYear(Year yr);
-	using Date = StrongType::Typedef<int32_t, struct DateTag, StrongType::Compare, StrongType::Integer>;
+	static void ConvertDateToYMD(Date date, YearMonthDay * ymd);
-
+	static Date ConvertYMDToDate(Year year, Month month, Day day);
-	/** The fraction of a date we're in, i.e. the number of ticks since the last date changeover. */
+	static void SetDate(Date date, DateFract fract);
-	using DateFract = uint16_t;
-
-	/** Type for the year, note: 0 based, i.e. starts at the year 0. */
-	using Year = StrongType::Typedef<int32_t, struct YearTag, StrongType::Compare, StrongType::Integer>;
-	/** Type for the month, note: 0 based, i.e. 0 = January, 11 = December. */
-	using Month = uint8_t;
-	/** Type for the day of the month, note: 1 based, first day of a month is 1. */
-	using Day = uint8_t;
 
 	/**
-	 * Data structure to convert between Date and triplet (year, month, and day).
+	* Calculate the year of a given date.
-	 * @see TimerGameCalendar::ConvertDateToYMD(), TimerGameCalendar::ConvertYMDToDate()
+	* @param date The date to consider.
-	 */
+	* @return the year.
-	struct YearMonthDay {
+	*/
-		Year  year;   ///< Year (0...)
+	static constexpr Year DateToYear(Date date)
-		Month month;  ///< Month (0..11)
+	{
-		Day   day;    ///< Day (1..31)
+		/* Hardcode the number of days in a year because we can't access CalendarTime from here. */
-	};
+		return static_cast<int32_t>(date) / 366;
+	}
 
-	static bool IsLeapYear(TimerGameCalendar::Year yr);
+	/**
-	static void ConvertDateToYMD(TimerGameCalendar::Date date, YearMonthDay *ymd);
+	* Calculate the date of the first day of a given year.
-	static TimerGameCalendar::Date ConvertYMDToDate(TimerGameCalendar::Year year, TimerGameCalendar::Month month, TimerGameCalendar::Day day);
+	* @param year the year to get the first day of.
-	static void SetDate(TimerGameCalendar::Date date, TimerGameCalendar::DateFract fract);
+	* @return the date.
+	*/
+	static constexpr Date DateAtStartOfYear(Year year)
+	{
+		int32_t year_as_int = static_cast<int32_t>(year);
+		uint number_of_leap_years = (year == 0) ? 0 : ((year_as_int - 1) / 4 - (year_as_int - 1) / 100 + (year_as_int - 1) / 400 + 1);
+
+		/* Hardcode the number of days in a year because we can't access CalendarTime from here. */
+		return (365 * year_as_int) + number_of_leap_years;
+	}
 
 	static Year year; ///< Current year, starting at 0.
 	static Month month; ///< Current month (0..11).
@@ -111,4 +136,53 @@ public:
 	static DateFract date_fract; ///< Fractional part of the day.
 };
 
+/**
+ * Storage class for Calendar time constants.
+ */
+class CalendarTime {
+public:
+	static constexpr int DAYS_IN_YEAR = 365; ///< days per year
+	static constexpr int DAYS_IN_LEAP_YEAR = 366; ///< sometimes, you need one day more...
+	static constexpr int MONTHS_IN_YEAR = 12; ///< months per year
+
+	static constexpr int SECONDS_PER_DAY = 2;   ///< approximate seconds per day, not for precise calculations
+
+	/*
+	 * ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR and DAYS_TILL_ORIGINAL_BASE_YEAR are
+	 * primarily used for loading newgrf and savegame data and returning some
+	 * newgrf (callback) functions that were in the original (TTD) inherited
+	 * format, where 'TimerGameCalendar::date == 0' meant that it was 1920-01-01.
+	 */
+
+	/** The minimum starting year/base year of the original TTD */
+	static constexpr TimerGameCalendar::Year ORIGINAL_BASE_YEAR = 1920;
+	/** The original ending year */
+	static constexpr TimerGameCalendar::Year ORIGINAL_END_YEAR = 2051;
+	/** The maximum year of the original TTD */
+	static constexpr TimerGameCalendar::Year ORIGINAL_MAX_YEAR = 2090;
+
+	/** The absolute minimum & maximum years in OTTD */
+	static constexpr TimerGameCalendar::Year MIN_YEAR = 0;
+
+	/** The default starting year */
+	static constexpr TimerGameCalendar::Year DEF_START_YEAR = 1950;
+	/** The default scoring end year */
+	static constexpr TimerGameCalendar::Year DEF_END_YEAR = ORIGINAL_END_YEAR - 1;
+
+	/**
+	 * MAX_YEAR, nicely rounded value of the number of years that can
+	 * be encoded in a single 32 bits date, about 2^31 / 366 years.
+	 */
+	static constexpr TimerGameCalendar::Year MAX_YEAR = 5000000;
+
+	/** The date of the first day of the original base year. */
+	static constexpr TimerGameCalendar::Date DAYS_TILL_ORIGINAL_BASE_YEAR = TimerGameCalendar::DateAtStartOfYear(ORIGINAL_BASE_YEAR);
+
+	/** The date of the last day of the max year. */
+	static constexpr TimerGameCalendar::Date MAX_DATE = TimerGameCalendar::DateAtStartOfYear(CalendarTime::MAX_YEAR + 1) - 1;
+
+	static constexpr TimerGameCalendar::Year INVALID_YEAR = -1; ///< Representation of an invalid year
+	static constexpr TimerGameCalendar::Date INVALID_DATE = -1; ///< Representation of an invalid date
+};
+
 #endif /* TIMER_GAME_CALENDAR_H */

src/timer/timer_game_tick.h

@@ -14,9 +14,6 @@
 
 #include <chrono>
 
-/** Estimation of how many ticks fit in a single second. */
-static const uint TICKS_PER_SECOND = 1000 / MILLISECONDS_PER_TICK;
-
 /**
  * Timer that represents the game-ticks. It will pause when the game is paused.
  *
@@ -24,6 +21,8 @@ static const uint TICKS_PER_SECOND = 1000 / MILLISECONDS_PER_TICK;
  */
 class TimerGameTick {
 public:
+	using Ticks = int32_t; ///< The type to store ticks in
+
 	using TPeriod = uint;
 	using TElapsed = uint;
 	struct TStorage {
@@ -33,4 +32,28 @@ public:
 	static uint64_t counter; ///< Monotonic counter, in ticks, since start of game.
 };
 
+/**
+ * Storage class for Ticks constants.
+ */
+class Ticks {
+public:
+	static constexpr TimerGameTick::Ticks INVALID_TICKS = -1; ///< Representation of an invalid number of ticks.
+
+	/**
+	 * 1 day is 74 ticks; TimerGameCalendar::date_fract used to be uint16_t and incremented by 885. On an overflow the new day begun and 65535 / 885 = 74.
+	 * 1 tick is approximately 27 ms.
+	 * 1 day is thus about 2 seconds (74 * 27 = 1998) on a machine that can run OpenTTD normally
+	 */
+	static constexpr TimerGameTick::Ticks DAY_TICKS = 74; ///< ticks per day
+	static constexpr TimerGameTick::Ticks TICKS_PER_SECOND = 1000 / MILLISECONDS_PER_TICK; ///< Estimation of how many ticks fit in a single second.
+
+	static constexpr TimerGameTick::Ticks STATION_RATING_TICKS = 185; ///< Cycle duration for updating station rating.
+	static constexpr TimerGameTick::Ticks STATION_ACCEPTANCE_TICKS = 250; ///< Cycle duration for updating station acceptance.
+	static constexpr TimerGameTick::Ticks STATION_LINKGRAPH_TICKS = 504; ///< Cycle duration for cleaning dead links.
+	static constexpr TimerGameTick::Ticks CARGO_AGING_TICKS = 185; ///< Cycle duration for aging cargo.
+	static constexpr TimerGameTick::Ticks INDUSTRY_PRODUCE_TICKS = 256; ///< Cycle duration for industry production.
+	static constexpr TimerGameTick::Ticks TOWN_GROWTH_TICKS = 70;  ///< Cycle duration for towns trying to grow (this originates from the size of the town array in TTD).
+	static constexpr TimerGameTick::Ticks INDUSTRY_CUT_TREE_TICKS = INDUSTRY_PRODUCE_TICKS * 2; ///< Cycle duration for lumber mill's extra action.
+};
+
 #endif /* TIMER_GAME_TICK_H */

src/timetable.h

@@ -10,7 +10,7 @@
 #ifndef TIMETABLE_H
 #define TIMETABLE_H
 
-#include "date_type.h"
+#include "timer/timer_game_tick.h"
 #include "timer/timer_game_calendar.h"
 #include "vehicle_type.h"
 
@@ -18,6 +18,6 @@ static const TimerGameCalendar::Year MAX_TIMETABLE_START_YEARS = 15; ///< The ma
 
 void ShowTimetableWindow(const Vehicle *v);
 void UpdateVehicleTimetable(Vehicle *v, bool travelling);
-void SetTimetableParams(int param1, int param2, Ticks ticks);
+void SetTimetableParams(int param1, int param2, TimerGameTick::Ticks ticks);
 
 #endif /* TIMETABLE_H */

src/timetable_cmd.cpp

@@ -10,6 +10,7 @@
 #include "stdafx.h"
 #include "command_func.h"
 #include "company_func.h"
+#include "timer/timer_game_tick.h"
 #include "timer/timer_game_calendar.h"
 #include "window_func.h"
 #include "vehicle_base.h"
@@ -303,11 +304,11 @@ CommandCost CmdSetTimetableStart(DoCommandFlag flags, VehicleID veh_id, bool tim
 	int total_duration = v->orders->GetTimetableTotalDuration();
 
 	/* Don't let a timetable start more than 15 years into the future or 1 year in the past. */
-	if (start_date < 0 || start_date > MAX_DATE) return CMD_ERROR;
+	if (start_date < 0 || start_date > CalendarTime::MAX_DATE) return CMD_ERROR;
-	if (start_date - TimerGameCalendar::date > DateAtStartOfYear(MAX_TIMETABLE_START_YEARS)) return CMD_ERROR;
+	if (start_date - TimerGameCalendar::date > TimerGameCalendar::DateAtStartOfYear(MAX_TIMETABLE_START_YEARS)) return CMD_ERROR;
-	if (TimerGameCalendar::date - start_date > DAYS_IN_LEAP_YEAR) return CMD_ERROR;
+	if (TimerGameCalendar::date - start_date > CalendarTime::DAYS_IN_LEAP_YEAR) return CMD_ERROR;
 	if (timetable_all && !v->orders->IsCompleteTimetable()) return CommandCost(STR_ERROR_TIMETABLE_INCOMPLETE);
-	if (timetable_all && start_date + total_duration / DAY_TICKS > MAX_DATE) return CMD_ERROR;
+	if (timetable_all && start_date + total_duration / Ticks::DAY_TICKS > CalendarTime::MAX_DATE) return CMD_ERROR;
 
 	if (flags & DC_EXEC) {
 		std::vector<Vehicle *> vehs;
@@ -333,7 +334,7 @@ CommandCost CmdSetTimetableStart(DoCommandFlag flags, VehicleID veh_id, bool tim
 			w->lateness_counter = 0;
 			ClrBit(w->vehicle_flags, VF_TIMETABLE_STARTED);
 			/* Do multiplication, then division to reduce rounding errors. */
-			w->timetable_start = start_date + idx * total_duration / num_vehs / DAY_TICKS;
+			w->timetable_start = start_date + idx * total_duration / num_vehs / Ticks::DAY_TICKS;
 			SetWindowDirty(WC_VEHICLE_TIMETABLE, w->index);
 			++idx;
 		}
@@ -426,7 +427,7 @@ void UpdateVehicleTimetable(Vehicle *v, bool travelling)
 		just_started = !HasBit(v->vehicle_flags, VF_TIMETABLE_STARTED);
 
 		if (v->timetable_start != 0) {
-			v->lateness_counter = static_cast<int32_t>(TimerGameCalendar::date - v->timetable_start) * DAY_TICKS + TimerGameCalendar::date_fract;
+			v->lateness_counter = static_cast<int32_t>(TimerGameCalendar::date - v->timetable_start) * Ticks::DAY_TICKS + TimerGameCalendar::date_fract;
 			v->timetable_start = 0;
 		}
 
@@ -460,7 +461,7 @@ void UpdateVehicleTimetable(Vehicle *v, bool travelling)
 		 * the timetable entry like is done for road vehicles/ships.
 		 * Thus always make sure at least one tick is used between the
 		 * processing of different orders when filling the timetable. */
-		uint time_to_set = CeilDiv(std::max(time_taken, 1U), DAY_TICKS) * DAY_TICKS;
+		uint time_to_set = CeilDiv(std::max(time_taken, 1U), Ticks::DAY_TICKS) * Ticks::DAY_TICKS;
 
 		if (travelling && (autofilling || !real_current_order->IsTravelTimetabled())) {
 			ChangeTimetable(v, v->cur_real_order_index, time_to_set, MTF_TRAVEL_TIME, autofilling);
@@ -493,10 +494,10 @@ void UpdateVehicleTimetable(Vehicle *v, bool travelling)
 	 * check how many ticks the (fully filled) timetable has. If a timetable cycle is
 	 * shorter than the amount of ticks we are late we reduce the lateness by the
 	 * length of a full cycle till lateness is less than the length of a timetable
-	 * cycle. When the timetable isn't fully filled the cycle will be INVALID_TICKS. */
+	 * cycle. When the timetable isn't fully filled the cycle will be Ticks::INVALID_TICKS. */
 	if (v->lateness_counter > (int)timetabled) {
-		Ticks cycle = v->orders->GetTimetableTotalDuration();
+		TimerGameTick::Ticks cycle = v->orders->GetTimetableTotalDuration();
-		if (cycle != INVALID_TICKS && v->lateness_counter > cycle) {
+		if (cycle != Ticks::INVALID_TICKS && v->lateness_counter > cycle) {
 			v->lateness_counter %= cycle;
 		}
 	}

src/timetable_gui.cpp

@@ -18,6 +18,7 @@
 #include "string_func.h"
 #include "gfx_func.h"
 #include "company_func.h"
+#include "timer/timer_game_tick.h"
 #include "timer/timer_game_calendar.h"
 #include "date_gui.h"
 #include "vehicle_gui.h"
@@ -34,8 +35,8 @@
 
 /** Container for the arrival/departure dates of a vehicle */
 struct TimetableArrivalDeparture {
-	Ticks arrival;   ///< The arrival time
+	TimerGameTick::Ticks arrival;   ///< The arrival time
-	Ticks departure; ///< The departure time
+	TimerGameTick::Ticks departure; ///< The departure time
 };
 
 /**
@@ -44,14 +45,14 @@ struct TimetableArrivalDeparture {
  * @param param2 the second DParam to fill
  * @param ticks  the number of ticks to 'draw'
  */
-void SetTimetableParams(int param1, int param2, Ticks ticks)
+void SetTimetableParams(int param1, int param2, TimerGameTick::Ticks ticks)
 {
 	if (_settings_client.gui.timetable_in_ticks) {
 		SetDParam(param1, STR_TIMETABLE_TICKS);
 		SetDParam(param2, ticks);
 	} else {
 		SetDParam(param1, STR_TIMETABLE_DAYS);
-		SetDParam(param2, ticks / DAY_TICKS);
+		SetDParam(param2, ticks / Ticks::DAY_TICKS);
 	}
 }
 
@@ -85,7 +86,7 @@ static bool CanDetermineTimeTaken(const Order *order, bool travelling)
  * @param table Fill in arrival and departures including intermediate orders
  * @param offset Add this value to result and all arrivals and departures
  */
-static void FillTimetableArrivalDepartureTable(const Vehicle *v, VehicleOrderID start, bool travelling, std::vector<TimetableArrivalDeparture> &table, Ticks offset)
+static void FillTimetableArrivalDepartureTable(const Vehicle *v, VehicleOrderID start, bool travelling, std::vector<TimetableArrivalDeparture> &table, TimerGameTick::Ticks offset)
 {
 	assert(!table.empty());
 	assert(v->GetNumOrders() >= 2);
@@ -93,10 +94,10 @@ static void FillTimetableArrivalDepartureTable(const Vehicle *v, VehicleOrderID
 
 	/* Pre-initialize with unknown time */
 	for (int i = 0; i < v->GetNumOrders(); ++i) {
-		table[i].arrival = table[i].departure = INVALID_TICKS;
+		table[i].arrival = table[i].departure = Ticks::INVALID_TICKS;
 	}
 
-	Ticks sum = offset;
+	TimerGameTick::Ticks sum = offset;
 	VehicleOrderID i = start;
 	const Order *order = v->GetOrder(i);
 
@@ -182,7 +183,7 @@ struct TimetableWindow : Window {
 		assert(HasBit(v->vehicle_flags, VF_TIMETABLE_STARTED));
 
 		bool travelling = (!v->current_order.IsType(OT_LOADING) || v->current_order.GetNonStopType() == ONSF_STOP_EVERYWHERE);
-		Ticks start_time = TimerGameCalendar::date_fract - v->current_order_time;
+		TimerGameTick::Ticks start_time = TimerGameCalendar::date_fract - v->current_order_time;
 
 		FillTimetableArrivalDepartureTable(v, v->cur_real_order_index % v->GetNumOrders(), travelling, table, start_time);
 
@@ -193,7 +194,7 @@ struct TimetableWindow : Window {
 	{
 		switch (widget) {
 			case WID_VT_ARRIVAL_DEPARTURE_PANEL:
-				SetDParamMaxValue(1, DateAtStartOfYear(MAX_YEAR), 0, FS_SMALL);
+				SetDParamMaxValue(1, TimerGameCalendar::DateAtStartOfYear(CalendarTime::MAX_YEAR), 0, FS_SMALL);
 				size->width = std::max(GetStringBoundingBox(STR_TIMETABLE_ARRIVAL).width, GetStringBoundingBox(STR_TIMETABLE_DEPARTURE).width) + WidgetDimensions::scaled.hsep_wide + padding.width;
 				FALLTHROUGH;
 
@@ -425,7 +426,7 @@ struct TimetableWindow : Window {
 		/* Arrival and departure times are handled in an all-or-nothing approach,
 		 * i.e. are only shown if we can calculate all times.
 		 * Excluding order lists with only one order makes some things easier. */
-		Ticks total_time = v->orders != nullptr ? v->orders->GetTimetableDurationIncomplete() : 0;
+		TimerGameTick::Ticks total_time = v->orders != nullptr ? v->orders->GetTimetableDurationIncomplete() : 0;
 		if (total_time <= 0 || v->GetNumOrders() <= 1 || !HasBit(v->vehicle_flags, VF_TIMETABLE_STARTED)) return;
 
 		std::vector<TimetableArrivalDeparture> arr_dep(v->GetNumOrders());
@@ -435,8 +436,8 @@ struct TimetableWindow : Window {
 		int selected = this->sel_index;
 
 		Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
-		bool show_late = this->show_expected && v->lateness_counter > DAY_TICKS;
+		bool show_late = this->show_expected && v->lateness_counter > Ticks::DAY_TICKS;
-		Ticks offset = show_late ? 0 : -v->lateness_counter;
+		TimerGameTick::Ticks offset = show_late ? 0 : -v->lateness_counter;
 
 		for (int i = this->vscroll->GetPosition(); i / 2 < v->GetNumOrders(); ++i) { // note: i is also incremented in the loop
 			/* Don't draw anything if it extends past the end of the window. */
@@ -446,9 +447,9 @@ struct TimetableWindow : Window {
 			SetDParam(0, show_late ? TC_RED : TC_INVALID);
 			if (i % 2 == 0) {
 				/* Draw an arrival time. */
-				if (arr_dep[i / 2].arrival != INVALID_TICKS) {
+				if (arr_dep[i / 2].arrival != Ticks::INVALID_TICKS) {
 					/* First set the offset and text colour based on the expected/scheduled mode and some other things. */
-					Ticks this_offset;
+					TimerGameTick::Ticks this_offset;
 					if (this->show_expected && i / 2 == earlyID) {
 						/* Show expected arrival. */
 						this_offset = 0;
@@ -459,13 +460,13 @@ struct TimetableWindow : Window {
 					}
 
 					/* Now actually draw the arrival time. */
-					SetDParam(1, TimerGameCalendar::date + (arr_dep[i / 2].arrival + this_offset) / DAY_TICKS);
+					SetDParam(1, TimerGameCalendar::date + (arr_dep[i / 2].arrival + this_offset) / Ticks::DAY_TICKS);
 					DrawString(tr.left, tr.right, tr.top, STR_TIMETABLE_ARRIVAL, i == selected ? TC_WHITE : TC_BLACK);
 				}
 			} else {
 				/* Draw a departure time. */
-				if (arr_dep[i / 2].departure != INVALID_TICKS) {
+				if (arr_dep[i / 2].departure != Ticks::INVALID_TICKS) {
-					SetDParam(1, TimerGameCalendar::date + (arr_dep[i / 2].departure + offset) / DAY_TICKS);
+					SetDParam(1, TimerGameCalendar::date + (arr_dep[i / 2].departure + offset) / Ticks::DAY_TICKS);
 					DrawString(tr.left, tr.right, tr.top, STR_TIMETABLE_DEPARTURE, i == selected ? TC_WHITE : TC_BLACK);
 				}
 			}
@@ -482,7 +483,7 @@ struct TimetableWindow : Window {
 		const Vehicle *v = this->vehicle;
 		Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
 
-		Ticks total_time = v->orders != nullptr ? v->orders->GetTimetableDurationIncomplete() : 0;
+		TimerGameTick::Ticks total_time = v->orders != nullptr ? v->orders->GetTimetableDurationIncomplete() : 0;
 		if (total_time != 0) {
 			SetTimetableParams(0, 1, total_time);
 			DrawString(tr, v->orders->IsCompleteTimetable() ? STR_TIMETABLE_TOTAL_TIME : STR_TIMETABLE_TOTAL_TIME_INCOMPLETE);
@@ -499,7 +500,7 @@ struct TimetableWindow : Window {
 			/* We aren't running on a timetable yet, so how can we be "on time"
 			 * when we aren't even "on service"/"on duty"? */
 			DrawString(tr, STR_TIMETABLE_STATUS_NOT_STARTED);
-		} else if (v->lateness_counter == 0 || (!_settings_client.gui.timetable_in_ticks && v->lateness_counter / DAY_TICKS == 0)) {
+		} else if (v->lateness_counter == 0 || (!_settings_client.gui.timetable_in_ticks && v->lateness_counter / Ticks::DAY_TICKS == 0)) {
 			DrawString(tr, STR_TIMETABLE_STATUS_ON_TIME);
 		} else {
 			SetTimetableParams(0, 1, abs(v->lateness_counter));
@@ -570,7 +571,7 @@ struct TimetableWindow : Window {
 
 				if (order != nullptr) {
 					uint time = (selected % 2 != 0) ? order->GetTravelTime() : order->GetWaitTime();
-					if (!_settings_client.gui.timetable_in_ticks) time /= DAY_TICKS;
+					if (!_settings_client.gui.timetable_in_ticks) time /= Ticks::DAY_TICKS;
 
 					if (time != 0) {
 						SetDParam(0, time);
@@ -666,7 +667,7 @@ struct TimetableWindow : Window {
 			}
 
 			case WID_VT_CHANGE_TIME:
-				if (!_settings_client.gui.timetable_in_ticks) val *= DAY_TICKS;
+				if (!_settings_client.gui.timetable_in_ticks) val *= Ticks::DAY_TICKS;
 
 				if (this->change_timetable_all) {
 					Command<CMD_BULK_CHANGE_TIMETABLE>::Post(STR_ERROR_CAN_T_TIMETABLE_VEHICLE, v->index, mtf, ClampTo<uint16_t>(val));

src/toolbar_gui.cpp

@@ -1148,7 +1148,7 @@ void ToggleDirtyBlocks()
  */
 void SetStartingYear(TimerGameCalendar::Year year)
 {
-	_settings_game.game_creation.starting_year = Clamp(year, MIN_YEAR, MAX_YEAR);
+	_settings_game.game_creation.starting_year = Clamp(year, CalendarTime::MIN_YEAR, CalendarTime::MAX_YEAR);
 	TimerGameCalendar::Date new_date = TimerGameCalendar::ConvertYMDToDate(_settings_game.game_creation.starting_year, 0, 1);
 	/* If you open a savegame as scenario there may already be link graphs.*/
 	LinkGraphSchedule::instance.ShiftDates(new_date - TimerGameCalendar::date);
@@ -2357,8 +2357,8 @@ struct ScenarioEditorToolbarWindow : Window {
 
 	void OnPaint() override
 	{
-		this->SetWidgetDisabledState(WID_TE_DATE_BACKWARD, _settings_game.game_creation.starting_year <= MIN_YEAR);
+		this->SetWidgetDisabledState(WID_TE_DATE_BACKWARD, _settings_game.game_creation.starting_year <= CalendarTime::MIN_YEAR);
-		this->SetWidgetDisabledState(WID_TE_DATE_FORWARD, _settings_game.game_creation.starting_year >= MAX_YEAR);
+		this->SetWidgetDisabledState(WID_TE_DATE_FORWARD, _settings_game.game_creation.starting_year >= CalendarTime::MAX_YEAR);
 		this->SetWidgetDisabledState(WID_TE_ROADS, (GetRoadTypes(true) & ~_roadtypes_type) == ROADTYPES_NONE);
 		this->SetWidgetDisabledState(WID_TE_TRAMS, (GetRoadTypes(true) & _roadtypes_type) == ROADTYPES_NONE);
 
@@ -2398,7 +2398,7 @@ struct ScenarioEditorToolbarWindow : Window {
 				break;
 
 			case WID_TE_DATE:
-				SetDParam(0, TimerGameCalendar::ConvertYMDToDate(MAX_YEAR, 0, 1));
+				SetDParam(0, TimerGameCalendar::ConvertYMDToDate(CalendarTime::MAX_YEAR, 0, 1));
 				*size = GetStringBoundingBox(STR_JUST_DATE_LONG);
 				break;
 		}
@@ -2512,7 +2512,7 @@ struct ScenarioEditorToolbarWindow : Window {
 			value = atoi(str);
 		} else {
 			/* An empty string means revert to the default */
-			value = static_cast<int32_t>(DEF_START_YEAR);
+			value = static_cast<int32_t>(CalendarTime::DEF_START_YEAR);
 		}
 		SetStartingYear(value);
 

src/town.h

@@ -11,7 +11,7 @@
 #define TOWN_H
 
 #include "viewport_type.h"
-#include "date_type.h"
+#include "timer/timer_game_tick.h"
 #include "town_map.h"
 #include "subsidy_type.h"
 #include "newgrf_storage.h"
@@ -305,7 +305,7 @@ void MakeDefaultName(T *obj)
  * tick 0 is a valid tick so actual amount is one more than the counter value.
  */
 static inline uint16_t TownTicksToGameTicks(uint16_t ticks) {
-	return (std::min(ticks, MAX_TOWN_GROWTH_TICKS) + 1) * TOWN_GROWTH_TICKS - 1;
+	return (std::min(ticks, MAX_TOWN_GROWTH_TICKS) + 1) * Ticks::TOWN_GROWTH_TICKS - 1;
 }
 
 

src/town_cmd.cpp

@@ -822,7 +822,7 @@ static void TownTickHandler(Town *t)
 				i = t->growth_rate;
 			} else {
 				/* If growth failed wait a bit before retrying */
-				i = std::min<uint16_t>(t->growth_rate, TOWN_GROWTH_TICKS - 1);
+				i = std::min<uint16_t>(t->growth_rate, Ticks::TOWN_GROWTH_TICKS - 1);
 			}
 		}
 		t->grow_counter = i;
@@ -871,7 +871,7 @@ RoadType GetTownRoadType(const Town *t)
 		if (!HasBit(rti->flags, ROTF_TOWN_BUILD)) continue;
 
 		/* Not yet introduced at this date. */
-		if (IsInsideMM(rti->introduction_date, 0, static_cast<int32_t>(MAX_DATE)) && rti->introduction_date > TimerGameCalendar::date) continue;
+		if (IsInsideMM(rti->introduction_date, 0, static_cast<int32_t>(CalendarTime::MAX_DATE)) && rti->introduction_date > TimerGameCalendar::date) continue;
 
 		if (best != nullptr) {
 			if ((rti->max_speed == 0 ? assume_max_speed : rti->max_speed) < (best->max_speed == 0 ? assume_max_speed : best->max_speed)) continue;
@@ -1868,7 +1868,7 @@ static void DoCreateTown(Town *t, TileIndex tile, uint32_t townnameparts, TownSi
 	t->cache.population = 0;
 	/* Spread growth across ticks so even if there are many
 	 * similar towns they're unlikely to grow all in one tick */
-	t->grow_counter = t->index % TOWN_GROWTH_TICKS;
+	t->grow_counter = t->index % Ticks::TOWN_GROWTH_TICKS;
 	t->growth_rate = TownTicksToGameTicks(250);
 	t->show_zone = false;
 
@@ -3236,7 +3236,7 @@ static CommandCost TownActionFundBuildings(Town *t, DoCommandFlag flags)
 		 * tick-perfect and gives player some time window where they can
 		 * spam funding with the exact same efficiency.
 		 */
-		t->grow_counter = std::min<uint16_t>(t->grow_counter, 2 * TOWN_GROWTH_TICKS - (t->growth_rate - t->grow_counter) % TOWN_GROWTH_TICKS);
+		t->grow_counter = std::min<uint16_t>(t->grow_counter, 2 * Ticks::TOWN_GROWTH_TICKS - (t->growth_rate - t->grow_counter) % Ticks::TOWN_GROWTH_TICKS);
 
 		SetWindowDirty(WC_TOWN_VIEW, t->index);
 	}

src/town_gui.cpp

@@ -453,7 +453,7 @@ public:
 		}
 
 		if (HasBit(this->town->flags, TOWN_IS_GROWING)) {
-			SetDParam(0, RoundDivSU(this->town->growth_rate + 1, DAY_TICKS));
+			SetDParam(0, RoundDivSU(this->town->growth_rate + 1, Ticks::DAY_TICKS));
 			DrawString(tr, this->town->fund_buildings_months == 0 ? STR_TOWN_VIEW_TOWN_GROWS_EVERY : STR_TOWN_VIEW_TOWN_GROWS_EVERY_FUNDED);
 			tr.top += FONT_HEIGHT_NORMAL;
 		} else {

src/train_cmd.cpp

@@ -3353,12 +3353,12 @@ bool TrainController(Train *v, Vehicle *nomove, bool reverse)
 							v->cur_speed = 0;
 							v->subspeed = 0;
 							v->progress = 255; // make sure that every bit of acceleration will hit the signal again, so speed stays 0.
-							if (!_settings_game.pf.reverse_at_signals || ++v->wait_counter < _settings_game.pf.wait_oneway_signal * DAY_TICKS * 2) return false;
+							if (!_settings_game.pf.reverse_at_signals || ++v->wait_counter < _settings_game.pf.wait_oneway_signal * Ticks::DAY_TICKS * 2) return false;
 						} else if (HasSignalOnTrackdir(gp.new_tile, i)) {
 							v->cur_speed = 0;
 							v->subspeed = 0;
 							v->progress = 255; // make sure that every bit of acceleration will hit the signal again, so speed stays 0.
-							if (!_settings_game.pf.reverse_at_signals || ++v->wait_counter < _settings_game.pf.wait_twoway_signal * DAY_TICKS * 2) {
+							if (!_settings_game.pf.reverse_at_signals || ++v->wait_counter < _settings_game.pf.wait_twoway_signal * Ticks::DAY_TICKS * 2) {
 								DiagDirection exitdir = TrackdirToExitdir(i);
 								TileIndex o_tile = TileAddByDiagDir(gp.new_tile, exitdir);
 
@@ -3978,14 +3978,14 @@ static bool TrainLocoHandler(Train *v, bool mode)
 		++v->wait_counter;
 
 		/* Should we try reversing this tick if still stuck? */
-		bool turn_around = v->wait_counter % (_settings_game.pf.wait_for_pbs_path * DAY_TICKS) == 0 && _settings_game.pf.reverse_at_signals;
+		bool turn_around = v->wait_counter % (_settings_game.pf.wait_for_pbs_path * Ticks::DAY_TICKS) == 0 && _settings_game.pf.reverse_at_signals;
 
 		if (!turn_around && v->wait_counter % _settings_game.pf.path_backoff_interval != 0 && v->force_proceed == TFP_NONE) return true;
 		if (!TryPathReserve(v)) {
 			/* Still stuck. */
 			if (turn_around) ReverseTrainDirection(v);
 
-			if (HasBit(v->flags, VRF_TRAIN_STUCK) && v->wait_counter > 2 * _settings_game.pf.wait_for_pbs_path * DAY_TICKS) {
+			if (HasBit(v->flags, VRF_TRAIN_STUCK) && v->wait_counter > 2 * _settings_game.pf.wait_for_pbs_path * Ticks::DAY_TICKS) {
 				/* Show message to player. */
 				if (_settings_client.gui.lost_vehicle_warn && v->owner == _local_company) {
 					SetDParam(0, v->index);
@@ -4179,7 +4179,7 @@ void Train::OnNewDay()
 
 		if (this->running_ticks != 0) {
 			/* running costs */
-			CommandCost cost(EXPENSES_TRAIN_RUN, this->GetRunningCost() * this->running_ticks / (DAYS_IN_YEAR  * DAY_TICKS));
+			CommandCost cost(EXPENSES_TRAIN_RUN, this->GetRunningCost() * this->running_ticks / (CalendarTime::DAYS_IN_YEAR  * Ticks::DAY_TICKS));
 
 			this->profit_this_year -= cost.GetCost();
 			this->running_ticks = 0;

src/vehicle.cpp

@@ -918,7 +918,7 @@ static void RunVehicleDayProc()
 	if (_game_mode != GM_NORMAL) return;
 
 	/* Run the day_proc for every DAY_TICKS vehicle starting at TimerGameCalendar::date_fract. */
-	for (size_t i = TimerGameCalendar::date_fract; i < Vehicle::GetPoolSize(); i += DAY_TICKS) {
+	for (size_t i = TimerGameCalendar::date_fract; i < Vehicle::GetPoolSize(); i += Ticks::DAY_TICKS) {
 		Vehicle *v = Vehicle::Get(i);
 		if (v == nullptr) continue;
 
@@ -1369,7 +1369,7 @@ bool Vehicle::HandleBreakdown()
  */
 void AgeVehicle(Vehicle *v)
 {
-	if (v->age < MAX_DATE) {
+	if (v->age < CalendarTime::MAX_DATE) {
 		v->age++;
 		if (v->IsPrimaryVehicle() && v->age == VEHICLE_PROFIT_MIN_AGE + 1) GroupStatistics::VehicleReachedMinAge(v);
 	}
@@ -1378,7 +1378,7 @@ void AgeVehicle(Vehicle *v)
 
 	auto age = v->age - v->max_age;
 	for (int32_t i = 0; i <= 4; i++) {
-		if (age == DateAtStartOfYear(i)) {
+		if (age == TimerGameCalendar::DateAtStartOfYear(i)) {
 			v->reliability_spd_dec <<= 1;
 			break;
 		}
@@ -1396,11 +1396,11 @@ void AgeVehicle(Vehicle *v)
 	if (EngineHasReplacementForCompany(c, v->engine_type, v->group_id)) return;
 
 	StringID str;
-	if (age == DateAtStartOfYear(-1)) {
+	if (age == TimerGameCalendar::DateAtStartOfYear(-1)) {
 		str = STR_NEWS_VEHICLE_IS_GETTING_OLD;
-	} else if (age == DateAtStartOfYear(0)) {
+	} else if (age == TimerGameCalendar::DateAtStartOfYear(0)) {
 		str = STR_NEWS_VEHICLE_IS_GETTING_VERY_OLD;
-	} else if (age > DateAtStartOfYear(0) && (static_cast<int32_t>(age) % DAYS_IN_LEAP_YEAR) == 0) {
+	} else if (age > TimerGameCalendar::DateAtStartOfYear(0) && (static_cast<int32_t>(age) % CalendarTime::DAYS_IN_LEAP_YEAR) == 0) {
 		str = STR_NEWS_VEHICLE_IS_GETTING_VERY_OLD_AND;
 	} else {
 		return;
@@ -2108,7 +2108,7 @@ void Vehicle::BeginLoading()
 {
 	assert(IsTileType(this->tile, MP_STATION) || this->type == VEH_SHIP);
 
-	Ticks travel_time = TimerGameTick::counter - this->last_loading_tick;
+	TimerGameTick::Ticks travel_time = TimerGameTick::counter - this->last_loading_tick;
 	if (this->current_order.IsType(OT_GOTO_STATION) &&
 			this->current_order.GetDestination() == this->last_station_visited) {
 		this->DeleteUnreachedImplicitOrders();

src/vehicle_func.h

@@ -11,7 +11,6 @@
 #define VEHICLE_FUNC_H
 
 #include "gfx_type.h"
-#include "date_type.h"
 #include "direction_type.h"
 #include "command_type.h"
 #include "vehicle_type.h"
@@ -25,7 +24,7 @@
 #define IS_CUSTOM_FIRSTHEAD_SPRITE(x) (x == 0xFD)
 #define IS_CUSTOM_SECONDHEAD_SPRITE(x) (x == 0xFE)
 
-static const int VEHICLE_PROFIT_MIN_AGE = DAYS_IN_YEAR * 2; ///< Only vehicles older than this have a meaningful profit.
+static const int VEHICLE_PROFIT_MIN_AGE = CalendarTime::DAYS_IN_YEAR * 2; ///< Only vehicles older than this have a meaningful profit.
 static const Money VEHICLE_PROFIT_THRESHOLD = 10000;        ///< Threshold for a vehicle to be considered making good profit.
 
 /**

src/vehicle_gui.cpp

@@ -1733,7 +1733,7 @@ void BaseVehicleListWindow::DrawVehicleListItems(VehicleID selected_vehicle, int
 				if (v->IsChainInDepot()) {
 					tc = TC_BLUE;
 				} else {
-					tc = (v->age > v->max_age - DAYS_IN_LEAP_YEAR) ? TC_RED : TC_BLACK;
+					tc = (v->age > v->max_age - CalendarTime::DAYS_IN_LEAP_YEAR) ? TC_RED : TC_BLACK;
 				}
 
 				SetDParam(0, v->unitnumber);
@@ -2438,7 +2438,7 @@ struct VehicleDetailsWindow : Window {
 
 			case WID_VD_SERVICING_INTERVAL:
 				SetDParamMaxValue(0, MAX_SERVINT_DAYS); // Roughly the maximum interval
-				SetDParamMaxValue(1, DateAtStartOfYear(MAX_YEAR)); // Roughly the maximum year
+				SetDParamMaxValue(1, TimerGameCalendar::DateAtStartOfYear(CalendarTime::MAX_YEAR)); // Roughly the maximum year
 				size->width = std::max(
 					GetStringBoundingBox(STR_VEHICLE_DETAILS_SERVICING_INTERVAL_PERCENT).width,
 					GetStringBoundingBox(STR_VEHICLE_DETAILS_SERVICING_INTERVAL_DAYS).width
@@ -2495,9 +2495,9 @@ struct VehicleDetailsWindow : Window {
 				Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
 
 				/* Draw running cost */
-				SetDParam(1, DateToYear(v->age));
+				SetDParam(1, TimerGameCalendar::DateToYear(v->age));
-				SetDParam(0, (v->age + DAYS_IN_YEAR < v->max_age) ? STR_VEHICLE_INFO_AGE : STR_VEHICLE_INFO_AGE_RED);
+				SetDParam(0, (v->age + CalendarTime::DAYS_IN_YEAR < v->max_age) ? STR_VEHICLE_INFO_AGE : STR_VEHICLE_INFO_AGE_RED);
-				SetDParam(2, DateToYear(v->max_age));
+				SetDParam(2, TimerGameCalendar::DateToYear(v->max_age));
 				SetDParam(3, v->GetDisplayRunningCost());
 				DrawString(tr, STR_VEHICLE_INFO_AGE_RUNNING_COST_YR);
 				tr.top += FONT_HEIGHT_NORMAL;
@@ -2809,7 +2809,7 @@ void CcStartStopVehicle(Commands cmd, const CommandCost &result, VehicleID veh_i
 
 	StringID msg = (v->vehstatus & VS_STOPPED) ? STR_VEHICLE_COMMAND_STOPPED : STR_VEHICLE_COMMAND_STARTED;
 	Point pt = RemapCoords(v->x_pos, v->y_pos, v->z_pos);
-	AddTextEffect(msg, pt.x, pt.y, DAY_TICKS, TE_RISING);
+	AddTextEffect(msg, pt.x, pt.y, Ticks::DAY_TICKS, TE_RISING);
 }
 
 /**