def add_round_date(round_date)
      round_date = round_date.to_s.strip
      parsed_date = Util::Date.parse(round_date)
      raise "invalid round date (#{round_date})" unless parsed_date
      @round_dates << parsed_date
    end
def add_round_date(round_date)
      round_date = round_date.to_s.strip
      parsed_date = Util::Date.parse(round_date)
      raise "invalid round date (#{round_date})" unless parsed_date
      @round_dates << parsed_date
    end
Add a round date.