diff --git a/src/network/core/network_game_info.cpp b/src/network/core/network_game_info.cpp
index 8073edb247..6f22e24fd2 100644
--- a/src/network/core/network_game_info.cpp
+++ b/src/network/core/network_game_info.cpp
@@ -366,8 +366,8 @@ 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.calendar_date = p.Recv_uint16() + CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
-				info.calendar_start = p.Recv_uint16() + CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
+				info.calendar_date = CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR + p.Recv_uint16();
+				info.calendar_start = CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR + p.Recv_uint16();
 			}
 			if (game_info_version < 6) while (p.Recv_uint8() != 0) {} // Used to contain the map-name.
 			info.map_width      = p.Recv_uint16();
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 57c861f9de..bae0c25a96 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -1018,7 +1018,7 @@ static ChangeInfoResult CommonVehicleChangeInfo(EngineInfo *ei, int prop, ByteRe
 {
 	switch (prop) {
 		case 0x00: // Introduction date
-			ei->base_intro = buf.ReadWord() + CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR;
+			ei->base_intro = CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR + buf.ReadWord();
 			break;
 
 		case 0x02: // Decay speed
diff --git a/src/newgrf_text.cpp b/src/newgrf_text.cpp
index c62ce6fbe7..ae10192f7b 100644
--- a/src/newgrf_text.cpp
+++ b/src/newgrf_text.cpp
@@ -905,7 +905,7 @@ char32_t RemapNewGRFStringControlCode(char32_t scc, const char **str, StringPara
 
 			/* 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() + CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR); break;
+			case SCC_NEWGRF_PRINT_WORD_DATE_SHORT:  parameters.SetParam(0, CalendarTime::DAYS_TILL_ORIGINAL_BASE_YEAR + _newgrf_textrefstack.PopUnsignedWord()); break;
 
 			case SCC_NEWGRF_DISCARD_WORD:           _newgrf_textrefstack.PopUnsignedWord(); break;