diff --git a/src/cheat_gui.cpp b/src/cheat_gui.cpp
--- a/src/cheat_gui.cpp
+++ b/src/cheat_gui.cpp
@@ -112,13 +112,13 @@ static int32 ClickChangeDateCheat(int32 
 	ConvertDateToYMD(TimerGameCalendar::date, &ymd);
 	Date new_date = ConvertYMDToDate(new_value, ymd.month, ymd.day);
 
-	/* Change the date. */
-	TimerGameCalendar::SetDate(new_date, TimerGameCalendar::date_fract);
-
-	/* Shift cached dates. */
+	/* Shift cached dates before we change the date. */
 	for (auto v : Vehicle::Iterate()) v->ShiftDates(new_date - TimerGameCalendar::date);
 	LinkGraphSchedule::instance.ShiftDates(new_date - TimerGameCalendar::date);
 
+	/* Now it's safe to actually change the date. */
+	TimerGameCalendar::SetDate(new_date, TimerGameCalendar::date_fract);
+
 	EnginesMonthlyLoop();
 	SetWindowDirty(WC_STATUS_BAR, 0);
 	InvalidateWindowClassesData(WC_BUILD_STATION, 0);