protected function _isExpired($date)
    {
        if ($date) {
            $years = substr($date, 2, 2);
            $month = substr($date, 0, 2);
            $day = date("t", mktime(11, 59, 59, $month, 1, $years));

            $expDate = mktime(23, 59, 59, $month, $day, $years);
            if (time() > $expDate) {
                return true;
            }
        }

        return false;
    }