CSupportTimetableCache::GetDayBegin

static function GetDayBegin($d)
{
	if(self::Possible("@" . $d))
	{
		$localTime =  new DateTime("@" . $d); 
		$localTime->setTimezone(self::GetTimeZone());
		$localTime->setTime(0, 0, 0);
		return intval($localTime->format('U'));
	}
	else
	{
		return mktime(0, 0, 0, date("m", $d)  , date("d", $d), date("Y", $d));
	}
}