def two_dates_to_range(date_a, date_b)
    if date_a.month == date_b.month
      "#{Date::ABBR_MONTHNAMES[date_a.mon]} #{date_a.day}-#{date_b.day}"
    else
      "#{Date::ABBR_MONTHNAMES[date_a.mon]} #{date_a.day} - #{Date::ABBR_MONTHNAMES[date_b.mon]} #{date_b.day}"
    end
  end