function OffsetDate($dayFraction, $date=false)
	{
		if (!$date) {
			$date = $this->sysDate;
		}

		$fraction = $dayFraction * 24 * 3600;
		return $date . ' + INTERVAL ' .	$fraction . ' SECOND';
//		return "from_unixtime(unix_timestamp($date)+$fraction)";
	}