@staticmethod
def format_expire_date(expiry_month, expiry_year):
    """
        Convert the given month and year in the format MMYY.
        :param int expiry_month: The month.
        :param int expiry_year: The year.
        :return str: The expiry date in the format MMYY.
        """
    return '%02d' % expiry_month + '%02d' % expiry_year
