diff --git a/src/misc.cpp b/src/misc.cpp
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -15,7 +15,7 @@
 #include "newgrf.h"
 #include "newgrf_house.h"
 #include "economy_func.h"
-#include "date_func.h"
+#include "timer/timer_game_calendar.h"
 #include "timer/timer_game_tick.h"
 #include "texteff.hpp"
 #include "gfx_func.h"
@@ -74,7 +74,7 @@ void InitializeGame(uint size_x, uint si
 	_newgrf_profilers.clear();
 
 	if (reset_date) {
-		TimerGameCalendar::SetDate(ConvertYMDToDate(_settings_game.game_creation.starting_year, 0, 1), 0);
+		TimerGameCalendar::SetDate(TimerGameCalendar::ConvertYMDToDate(_settings_game.game_creation.starting_year, 0, 1), 0);
 		InitializeOldNames();
 	}