code: function getHolidayName (date) {
    date = this.toDate(date);
    if (!date) {
      return null;
    }
    var key = (date.getMonth() + 1) * 100 + date.getDate();
    var holidays = getHolidays(date.getFullYear());
    return holidays[key] || null;
  }
docs: 祝日名を取得
  @method getHolidayName
  @param  {DATE}   date
  @return {String} name