public static function unixtime2Sql($dateNum)
	{
		// 31/01/2016 20:20:00 --> 2016-01-31 00:00
		if ($dateNum == null) {
			return DaoOne::$dateEpoch;
		}
		try {
			$date2 = new DateTime(date("Y-m-d H:i:s.u", $dateNum));
		} catch (Exception $e) {
			return DaoOne::$dateEpoch;
		}
		return $date2->format('Y-m-d H:i:s.u');
	}