/**
* Calculates the date of the Nth weekday of the month,
* such as the second Saturday of January 2000
*
* @param int $week
* the number of the week to get
* (1 = first, etc. Also can be 'last'.)
* @param int $dow
* the day of the week (0 = Sunday)
* @param int $month
* the month
* @param int $year
* the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* Do not add leading 0's for years prior to 1000.
* @param string $format
* the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*
*/
static function NWeekdayOfMonth($week, $dow, $month, $year, $format = DATE_CALC_FORMAT)
{
if (is_numeric($week)) {
$DOW1day = ($week - 1) * 7 + 1;
$DOW1 = Calc::dayOfWeek($DOW1day, $month, $year);
$wdate = ($week - 1) * 7 + 1 + (7 + $dow - $DOW1) % 7;
if ($wdate > Calc::daysInMonth($month, $year)) {
return -1;
} else {
return Calc::dateFormat($wdate, $month, $year, $format);
}
} elseif ($week == 'last' && $dow < 7) {
$lastday = Calc::daysInMonth($month, $year);
$lastdow = Calc::dayOfWeek($lastday, $month, $year);
$diff = $dow - $lastdow;
if ($diff > 0) {
return Calc::dateFormat($lastday - (7 - $diff), $month, $year, $format);
} else {
return Calc::dateFormat($lastday + $diff, $month, $year, $format);
}
} else {
return -1;
}
}
