Method validUntil

public static function validUntil($date, $days)
{
    $db = Factory::getDBO();
    $nullDate = $db->getNullDate();
    $now = Factory::getDate();
    $config = Factory::getConfig();
    $orderDate = Factory::getDate($date);
    $tz = new DateTimeZone($config->get('offset'));
    $orderDate->setTimezone($tz);
    $daysTime = $days * 24 * 60 * 60;
    $expireDate = $orderDate->toUnix() + $daysTime;
    if ($days == '0') {
        // NO LIMIT
        return false;
    } else {
        return HTMLHelper::date($expireDate, Text::_('DATE_FORMAT_LC2'));
    }
}