Method normalizeDisplayValue

packages/main/src/DatePicker.ts:837–843

* The parser understands many formats, but we need one format * @protected

(value: string)

	 * @protected
	 */
	normalizeDisplayValue(value: string) {
		if (value === "" || !this.getDisplayFormat().parse(value, true)) {
			return value;
		}

		return this.getDisplayFormat().format(this.getDisplayFormat().parse(value, true), true); // it is important to both parse and format the date as UTC
	}

	get _lastDayOfTheYear() {
		const currentYear = UI5Date.getInstance().getFullYear();