public function getArchiveMonth()
    {
        $month = $this->request->param('Month');

        if (preg_match('/^[0-9]{1,2}$/', $month)) {
            if ($month > 0 && $month < 13) {
                if (checkdate($month, 01, $this->getArchiveYear())) {
                    return (int) $month;
                }
            }
        }

        return null;
    }