_selectYear(e) {
      e.preventDefault();
      const target = e.target;
      if (target.className.indexOf("ui5-yp-item") > -1) {
        const timestamp = this._getTimestampFromDom(target);
        this._safelySetTimestamp(timestamp);
        this.fireEvent("change", {
          timestamp: this.timestamp
        });
      }
    }
User clicked with the mouser or pressed Enter/Space
@param { Event } e
@private