code: function open (date) {
    date = this.toDate(date);
    if (!date) {
      return false;
    }
    var info = getDayInfo(this.dayInfo, date, true);
    if (!info.open) {
      info.open = true;
      delete info.close;
      this.resetBizCache(date);
    }
    return true;
  }
docs: 指定日を営業日に設定します（休日設定を無視します）
  @method open
  @param  {DATE}    date
  @return {Boolean} success