src/date.h

   1 /* date.h
   2  * Routines for date handling
   3  * Copyright (C) 2010,2015,2018 Olly Betts
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #ifdef __cplusplus
  21 extern "C" {
  22 #endif
  23
  24 extern int is_leap_year(int year);
  25
  26 /* Return last day for given month of given year. */
  27 unsigned int last_day(int year, int month);
  28
  29 int days_since_1900(int y, int m, int d);
  30
  31 void ymd_from_days_since_1900(int days, int * py, int * pm, int * pd);
  32
  33 double julian_date_from_days_since_1900(int days);
  34
  35 #ifdef __cplusplus
  36 }
  37 #endif