/**
* This function returns the number of days in the month.
*
* @param $month (Optional) If empty, object's month. Default: empty.
* @param $year (Optional) If empty, object's year. Default: empty.
*
* @returns The number of days in the month.
*
* @static If $month and $year are passed.
*/
function getDaysInMonth($month = '', $year = '')
{
if (!$month) {
$month = $this->month;
}
if (!$year) {
$year = $this->year;
}
switch ((int) $month) {
case 1:
return 31;
case 2:
return YDDate::isLeapYear($year) ? 29 : 28;
case 3:
return 31;
case 4:
return 30;
case 5:
return 31;
case 6:
return 30;
case 7:
return 31;
case 8:
return 31;
case 9:
return 30;
case 10:
return 31;
case 11:
return 30;
case 12:
return 31;
}
return 0;
}
/**
* This function returns the weekday as an integer.
* 0 = Sunday - 6 = Saturday
*
* @param $date (Optional) A YDDate object, timestamp, array or string.
* If null, the date of the object. Default: null.
* @param $format (Optional) The format. Default: 'ISO'.
*
* @returns The weeday number.
*
* @static If $date is passed.
*/
function getWeekDay($date = null, $format = 'ISO')
{
if ($date === null) {
$date = $this->parse($date, $format);
} else {
$date = YDDate::parse($date, $format);
}
if (!$date['day'] && !$date['month'] && !$date['year']) {
return null;
}
$arr = array(0, 6, 2, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4);
$y = substr($date['year'], -2);
$a = $date['day'] + $y + floor($y / 4) + $arr[$date['month']];
if (YDDate::isLeapYear($date['year']) && $date['month'] <= 2 && $date['day'] < 29) {
$a--;
}
while ($a > 7) {
$a -= 7;
}
if ($date['year'] != 2000 && $date['year'] % 100 == 0) {
if ($date['year'] < 2000) {
$a += (2000 - $date['year']) / 100;
} else {
$a -= 2 * (($date['year'] - 2000) / 100);
}
}
return $a == 7 ? 0 : $a;
}
