Gets last week day

        :param including_today: If today is sunday and requesting next sunday
        :return: Date of last monday, tuesday ..

def get_last_weekday(self, including_today=False):
        """Gets last week day

        :param including_today: If today is sunday and requesting next sunday
        :return: Date of last monday, tuesday ..
        """
        weekday = self.date_time.weekday()
        return Weekday.get_last(weekday, including_today=including_today)