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/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file date_func.h Functions related to dates. */
#ifndef DATE_FUNC_H
#define DATE_FUNC_H
#include "date_type.h"
extern Year _cur_year;
extern Month _cur_month;
extern Date _date;
extern DateFract _date_fract;
extern uint16 _tick_counter;
void SetDate(Date date, DateFract fract);
void ConvertDateToYMD(Date date, YearMonthDay *ymd);
Date ConvertYMDToDate(Year year, Month month, Day day);
Ticks GetCurrentTickCount();
#define YMD_TO_DATE(ymd) (ConvertYMDToDate(ymd.year, ymd.month, ymd.day))
/**
* Checks whether the given year is a leap year or not.
* @param yr The year to check.
* @return True if \c yr is a leap year, otherwise false.
*/
static inline bool IsLeapYear(Year yr)
{
return yr % 4 == 0 && (yr % 100 != 0 || yr % 400 == 0);
}
#endif /* DATE_FUNC_H */
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