Function SetStartingYear

src/toolbar_gui.cpp:1133–1148

* Set the starting year for a scenario. * @param year New starting year. */

 * @param year New starting year.
 */
void SetStartingYear(TimerGameCalendar::Year year)
{
	_settings_game.game_creation.starting_year = Clamp(year, CalendarTime::MIN_YEAR, CalendarTime::MAX_YEAR);
	TimerGameCalendar::Date new_calendar_date = TimerGameCalendar::ConvertYMDToDate(_settings_game.game_creation.starting_year, 0, 1);
	TimerGameEconomy::Date new_economy_date{new_calendar_date.base()};

	/* We must set both Calendar and Economy dates to keep them in sync. Calendar first. */
	TimerGameCalendar::SetDate(new_calendar_date, 0);

	/* If you open a savegame as a scenario, there may already be link graphs and/or vehicles. These use economy date. */
	LinkGraphSchedule::instance.ShiftDates(new_economy_date - TimerGameEconomy::date);
	for (auto v : Vehicle::Iterate()) v->ShiftDates(new_economy_date - TimerGameEconomy::date);

	/* Only change the date after changing cached values above. */
	TimerGameEconomy::SetDate(new_economy_date, 0);
}

/**
 * Choose the proper callback function for the main toolbar's help menu.