diff --git a/src/aircraft.h b/src/aircraft.h
index dbf9bfc63c..0beab20dfb 100644
--- a/src/aircraft.h
+++ b/src/aircraft.h
@@ -107,6 +107,7 @@ struct Aircraft FINAL : public SpecializedVehicle<Aircraft, VEH_AIRCRAFT> {
 	}
 
 	bool Tick() override;
+	void OnNewCalendarDay() override;
 	void OnNewEconomyDay() override;
 	uint Crash(bool flooded = false) override;
 	TileIndex GetOrderStationLocation(StationID station) override;
diff --git a/src/aircraft_cmd.cpp b/src/aircraft_cmd.cpp
index 5ce05b82b1..6002a05f20 100644
--- a/src/aircraft_cmd.cpp
+++ b/src/aircraft_cmd.cpp
@@ -440,6 +440,14 @@ Money Aircraft::GetRunningCost() const
 	return GetPrice(PR_RUNNING_AIRCRAFT, cost_factor, e->GetGRF());
 }
 
+/** Calendar day handler */
+void Aircraft::OnNewCalendarDay()
+{
+	if (!this->IsNormalAircraft()) return;
+	AgeVehicle(this);
+}
+
+/** Economy day handler */
 void Aircraft::OnNewEconomyDay()
 {
 	if (!this->IsNormalAircraft()) return;
@@ -449,7 +457,6 @@ void Aircraft::OnNewEconomyDay()
 	CheckOrders(this);
 
 	CheckVehicleBreakdown(this);
-	AgeVehicle(this);
 	CheckIfAircraftNeedsService(this);
 
 	if (this->running_ticks == 0) return;
diff --git a/src/openttd.cpp b/src/openttd.cpp
index c8106c8792..50521ab663 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -1415,6 +1415,7 @@ void StateGameLoop()
 		TimerManager<TimerGameEconomy>::Elapsed(1);
 		TimerManager<TimerGameTick>::Elapsed(1);
 		RunTileLoop();
+		RunVehicleCalendarDayProc();
 		CallVehicleTicks();
 		CallLandscapeTick();
 		BasePersistentStorageArray::SwitchMode(PSM_LEAVE_GAMELOOP);
diff --git a/src/roadveh.h b/src/roadveh.h
index e4cb266919..f05e7ee3a6 100644
--- a/src/roadveh.h
+++ b/src/roadveh.h
@@ -134,6 +134,7 @@ struct RoadVehicle FINAL : public GroundVehicle<RoadVehicle, VEH_ROAD> {
 	int GetDisplayImageWidth(Point *offset = nullptr) const;
 	bool IsInDepot() const override { return this->state == RVSB_IN_DEPOT; }
 	bool Tick() override;
+	void OnNewCalendarDay() override;
 	void OnNewEconomyDay() override;
 	uint Crash(bool flooded = false) override;
 	Trackdir GetVehicleTrackdir() const override;
diff --git a/src/roadveh_cmd.cpp b/src/roadveh_cmd.cpp
index 0998849bce..066ea84762 100644
--- a/src/roadveh_cmd.cpp
+++ b/src/roadveh_cmd.cpp
@@ -1706,10 +1706,16 @@ static void CheckIfRoadVehNeedsService(RoadVehicle *v)
 	SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, WID_VV_START_STOP);
 }
 
+/** Calandar day handler */
+void RoadVehicle::OnNewCalendarDay()
+{
+	if (!this->IsFrontEngine()) return;
+	AgeVehicle(this);
+}
+
+/** Economy day handler. */
 void RoadVehicle::OnNewEconomyDay()
 {
-	AgeVehicle(this);
-
 	if (!this->IsFrontEngine()) return;
 
 	if ((++this->day_counter & 7) == 0) DecreaseVehicleValue(this);
diff --git a/src/ship.h b/src/ship.h
index 85e3ee64ca..955bbf6bfe 100644
--- a/src/ship.h
+++ b/src/ship.h
@@ -45,6 +45,7 @@ struct Ship FINAL : public SpecializedVehicle<Ship, VEH_SHIP> {
 	Money GetRunningCost() const override;
 	bool IsInDepot() const override { return this->state == TRACK_BIT_DEPOT; }
 	bool Tick() override;
+	void OnNewCalendarDay() override;
 	void OnNewEconomyDay() override;
 	Trackdir GetVehicleTrackdir() const override;
 	TileIndex GetOrderStationLocation(StationID station) override;
diff --git a/src/ship_cmd.cpp b/src/ship_cmd.cpp
index fc5299f995..5e2ff388af 100644
--- a/src/ship_cmd.cpp
+++ b/src/ship_cmd.cpp
@@ -223,6 +223,13 @@ Money Ship::GetRunningCost() const
 	return GetPrice(PR_RUNNING_SHIP, cost_factor, e->GetGRF());
 }
 
+/** Calendar day handler. */
+void Ship::OnNewCalendarDay()
+{
+	AgeVehicle(this);
+}
+
+/** Economy day handler. */
 void Ship::OnNewEconomyDay()
 {
 	if ((++this->day_counter & 7) == 0) {
@@ -230,7 +237,6 @@ void Ship::OnNewEconomyDay()
 	}
 
 	CheckVehicleBreakdown(this);
-	AgeVehicle(this);
 	CheckIfShipNeedsService(this);
 
 	CheckOrders(this);
diff --git a/src/train.h b/src/train.h
index f6209d7b19..f863250e5c 100644
--- a/src/train.h
+++ b/src/train.h
@@ -123,6 +123,7 @@ struct Train FINAL : public GroundVehicle<Train, VEH_TRAIN> {
 	int GetDisplayImageWidth(Point *offset = nullptr) const;
 	bool IsInDepot() const override { return this->track == TRACK_BIT_DEPOT; }
 	bool Tick() override;
+	void OnNewCalendarDay() override;
 	void OnNewEconomyDay() override;
 	uint Crash(bool flooded = false) override;
 	Trackdir GetVehicleTrackdir() const override;
diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
index 73c66fadd9..5d019380d2 100644
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -4164,11 +4164,15 @@ static void CheckIfTrainNeedsService(Train *v)
 	SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, WID_VV_START_STOP);
 }
 
-/** Update day counters of the train vehicle. */
-void Train::OnNewEconomyDay()
+/** Calendar day handler. */
+void Train::OnNewCalendarDay()
 {
 	AgeVehicle(this);
+}
 
+/** Economy day handler. */
+void Train::OnNewEconomyDay()
+{
 	if ((++this->day_counter & 7) == 0) DecreaseVehicleValue(this);
 
 	if (this->IsFrontEngine()) {
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index 16cabda120..b2f5e37c90 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -916,6 +916,21 @@ void VehicleEnteredDepotThisTick(Vehicle *v)
 	v->vehstatus |= VS_STOPPED;
 }
 
+/**
+ * Age all vehicles, spreading out the action using the current TimerGameCalendar::date_fract.
+ */
+void RunVehicleCalendarDayProc()
+{
+	if (_game_mode != GM_NORMAL) return;
+
+	/* Run the calendar day proc for every DAY_TICKS vehicle starting at TimerGameCalendar::date_fract. */
+	for (size_t i = TimerGameCalendar::date_fract; i < Vehicle::GetPoolSize(); i += Ticks::DAY_TICKS) {
+		Vehicle *v = Vehicle::Get(i);
+		if (v == nullptr) continue;
+		v->OnNewCalendarDay();
+	}
+}
+
 /**
  * Increases the day counter for all vehicles and calls 1-day and 32-day handlers.
  * Each tick, it processes vehicles with "index % DAY_TICKS == TimerGameEconomy::date_fract",
diff --git a/src/vehicle_base.h b/src/vehicle_base.h
index 60056bf418..313ec18346 100644
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -567,7 +567,12 @@ public:
 	virtual bool Tick() { return true; };
 
 	/**
-	 * Calls the new economy day handler of the vehicle
+	 * Calls the new calendar day handler of the vehicle.
+	 */
+	virtual void OnNewCalendarDay() {};
+
+	/**
+	 * Calls the new economy day handler of the vehicle.
 	 */
 	virtual void OnNewEconomyDay() {};
 
diff --git a/src/vehicle_func.h b/src/vehicle_func.h
index 7595c9478b..f2d67227d5 100644
--- a/src/vehicle_func.h
+++ b/src/vehicle_func.h
@@ -62,6 +62,7 @@ CommandCost TunnelBridgeIsFree(TileIndex tile, TileIndex endtile, const Vehicle
 void DecreaseVehicleValue(Vehicle *v);
 void CheckVehicleBreakdown(Vehicle *v);
 void AgeVehicle(Vehicle *v);
+void RunVehicleCalendarDayProc();
 void VehicleEnteredDepotThisTick(Vehicle *v);
 
 UnitID GetFreeUnitNumber(VehicleType type);