function mdatetime($time = '', $timezone = '', $datetime_format = '') {
		if ($datetime_format == '') {
			$datetime_format = $this->dateFormat . ' ' . $this->timeFormat;
		}
		if ($time == '') {
			$time = 'now';
		}
		if ($timezone == '') {
			$timezone = $this->timeZone;
		}
		$utc = new \DateTimeZone($timezone);
		$dt = new \DateTime($time, $utc);
		return $dt->format($datetime_format);
	}