//
//	aegis - project change supervisor
//	Copyright (C) 2004-2006, 2008 Peter Miller
//
//	This program 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; either version 3 of the License, or
//	(at your option) any later version.
//
//	This program 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 this program. If not, see
//	<http://www.gnu.org/licenses/>.
//

#include <common/ac/string.h>
#include <common/ac/time.h>

#include <common/error.h> // for assert
#include <common/yyyymmdd_wk.h>


int
yyyymmdd_to_wday(int yyyy, int mm, int dd)
{
    struct tm tim;
    memset(&tim, 0, sizeof(tim));
    tim.tm_mday = dd;
    tim.tm_mon = mm - 1;
    tim.tm_year = yyyy - 1900;
#ifdef DEBUG
    time_t when = mktime(&tim);
    assert(when != (time_t)(-1));
#else
    mktime(&tim);
#endif
    return tim.tm_wday;
}


int
days_in_month(int year, int month)
{
    switch (month)
    {
    case 2:
	if (year % 4 == 0)
	{
	    if (year % 400 != 0)
		return 29;
	    if (year % 2000 != 0)
		return 29;
	}
	return 28;

    case 4:
    case 6:
    case 9:
    case 11:
	return 30;

    default:
	return 31;
    }
}