Method _modifyDateValue

packages/main/src/DatePicker.ts:572–580

* @param amount * @param unit * @param preserveDate whether to preserve the day of the month (f.e. 15th of March + 1 month = 15th of April) * @protected

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

	 * @protected
	 */
	_modifyDateValue(amount: number, unit: string, preserveDate?: boolean) {
		if (!this.dateValue) {
			return;
		}

		const modifiedDate = modifyDateBy(CalendarDate.fromLocalJSDate(this.dateValue), amount, unit, preserveDate, this._minDate, this._maxDate);
		const newValue = this.formatValue(modifiedDate.toUTCJSDate());
		this._updateValueAndFireEvents(newValue, true, ["change", "value-changed"]);
	}

	_updateValueAndFireEvents(value: string, normalizeValue: boolean, events: Array<"change" | "value-changed" | "input">, updateValue: boolean = true) {
		const valid = this._checkValueValidity(value);