docs: function(
      dateTimePattern, fallbackPattern, dateTimeSymbols) {
    /**
     * Date time pattern used to format the dates.
     * @private {string}
     */
    this.dateTimePattern_ = dateTimePattern;
  
    /**
     * Date time formatter used to format the dates.
     * @private {!DateTimeFormat}
     */
    this.dateTimeFormatter_ =
        new DateTimeFormat(dateTimePattern, dateTimeSymbols);
  
    /**
     * Fallback interval pattern.
     * @private {string}
     */
    this.fallbackPattern_ = fallbackPattern;
  }