Method _modifyTimestampBy

packages/main/src/YearPicker.ts:342–349

* Modifies timestamp by a given amount of years and, if necessary, loads the prev/next page. * @param amount * @private

(amount: number)

	 * @private
	 */
	_modifyTimestampBy(amount: number) {
		// Modify the current timestamp
		this._safelyModifyTimestampBy(amount, "year");
		this._updateSecondTimestamp();

		// Notify the calendar to update its timestamp
		this.fireDecoratorEvent("navigate", { timestamp: this.timestamp! });
	}

	_onkeyup(e: KeyboardEvent) {
		if (isSpace(e)) {