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date_func.h
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1 /* $Id: date_func.h 22411 2011-05-02 17:42:12Z rubidium $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * 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.
6 * 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.
7 * 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/>.
8 */
9
12 #ifndef DATE_FUNC_H
13 #define DATE_FUNC_H
14
15 #include "date_type.h"
16
17 extern Year _cur_year;
18 extern Month _cur_month;
19 extern Date _date;
20 extern DateFract _date_fract;
21 extern uint16 _tick_counter;
22
23 void SetDate(Date date, DateFract fract);
24 void ConvertDateToYMD(Date date, YearMonthDay *ymd);
25 Date ConvertYMDToDate(Year year, Month month, Day day);
26
32 static inline bool IsLeapYear(Year yr)
33 {
34 return yr % 4 == 0 && (yr % 100 != 0 || yr % 400 == 0);
35 }
36
37 #endif /* DATE_FUNC_H */