public static function LocalDate2OLE($date = null)
	{
		if (!isset($date)) {
			return "\x00\x00\x00\x00\x00\x00\x00\x00";
		}

		// factor used for separating numbers into 4 bytes parts
		$factor = pow(2, 32);

		// days from 1-1-1601 until the beggining of UNIX era
		$days = 134774;
		// calculate seconds
		$big_date = $days*24*3600 + gmmktime(date("H",$date),date("i",$date),date("s",$date),
											 date("m",$date),date("d",$date),date("Y",$date));
		// multiply just to make MS happy
		$big_date *= 10000000;

		$high_part = floor($big_date / $factor);
		// lower 4 bytes
		$low_part = floor((($big_date / $factor) - $high_part) * $factor);

		// Make HEX string
		$res = '';

		for ($i = 0; $i < 4; ++$i) {
			$hex = $low_part % 0x100;
			$res .= pack('c', $hex);
			$low_part /= 0x100;
		}
		for ($i = 0; $i < 4; ++$i) {
			$hex = $high_part % 0x100;
			$res .= pack('c', $hex);
			$high_part /= 0x100;
		}
		return $res;
	}