/**
* Returns date of the previous specific day of the week
* on or before the given date
*
* @param int $dow
* the day of the week (0 = Sunday)
* @param int $day
* the day of the month, default is current local day
* @param int $month
* the month, default is current local month
* @param int $year
* the year in four digit format, default is current local year
* @param string $format
* the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*
*/
static function prevDayOfWeekOnOrBefore($dow, $day = 0, $month = 0, $year = 0, $format = DATE_CALC_FORMAT)
{
return Calc::prevDayOfWeek($dow, $day, $month, $year, $format, true);
}