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<?php
/*
* This file is part of Zoph.
*
* Zoph 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 2 of the License, or
* (at your option) any later version.
*
* Zoph 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 Zoph; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
David Baldwin provided this code for use with the calendar class.
*/
function days_of_february($year)
{
$day = ($year & 3) ? 28 : ((!($year % 100) && ($year % 400)) ? 28 : 29);
return $day;
}
function date2num($day, $month, $year)
{
$mvec = array (0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334);
$mjd=($year-1)*365 + (($year-1)>>2);
$mjd += floor(($year - 1) / 400);
$mjd -= floor(($year - 1) / 100);
$mjd += $mvec[$month-1];
$mjd += $day;
if ((days_of_february($year) == 29)
&& ($month > 2))
$mjd++;
return $mjd;
}
function weekday_of_date ($day, $month, $year)
/*
Returns the weekday of a Gregorian/Julian calendar date
(month must be 1...12) and returns 0...6 (0==su, 1==mo, 2==tu...6==sa).
*/
{
$mjd = date2num($day, $month, $year) % 7;
return $mjd;
}
?>
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