Force the business_date to always be a date
        :param business_date:
        :return:

def business_date(self, business_date):
        """
        Force the business_date to always be a date
        :param business_date:
        :return:
        """
        if business_date is not None:
            if isinstance(business_date, type_check):
                self._business_date = parse(business_date).date()
            else:
                self._business_date= business_date