Day Of Week

This algorithm finds the current day of week according to the input date.

									/**************
Sunday = 0
Monday = 1
Tuesday = 2
Wednesday = 3
Thursday = 4
Friday = 5
Saturday = 6
**************/

function GetDayOfWeek($year, $month, $day) {
	$monthTable = array(0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4);

	$year -= (($month < 3) ? 1 : 0);

	return ($year + $year / 4 - $year / 100 + $year / 400 + $monthTable[$month - 1] + $day) % 7;
}

Example

									$value = GetDayOfWeek(2015, 8, 7);

Output