get _timestamp() {
      let timestamp = this.timestamp !== undefined ? this.timestamp : (0, _getTodayUTCTimestamp.default)(this._primaryCalendarType);
      if (this._maxTimestamp && this._maxTimestamp < timestamp) {
        timestamp = this._maxTimestamp;
      } else if (this._minTimestamp && this._minTimestamp > timestamp) {
        timestamp = this._minTimestamp;
      }
      return timestamp;
    }
Returns the effective timestamp to be used by the respective calendar part
@protected