/* * 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); /** * 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 */