Method _modifyTimestampBy

packages/main/src/DayPicker.ts:796–803

* Modifies the timestamp by a certain amount of days/months/years. * @param amount * @param unit * @param preserveDate whether to preserve the day of the month (f.e. 15th of March + 1 month = 15th of April) * @private

(amount: number, unit: string, preserveDate?: boolean)

	 * @private
	 */
	_modifyTimestampBy(amount: number, unit: string, preserveDate?: boolean) {
		// Modify the current timestamp
		this._safelyModifyTimestampBy(amount, unit, preserveDate);
		this._updateSecondTimestamp();

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

	/**
	 * Sets the timestamp to an absolute value.