public class OldDateVM {
	private static String formatAtUTC(Date date) {
		final SimpleDateFormat df = new SimpleDateFormat("yyyy.M.d.H.m.s.S", Locale.US);
		df.setTimeZone(TimeZone.getTimeZone("UTC"));
		return df.format(date);
	}

	private static String formatAtUTC(ZonedDateTime zonedDateTime) {
		final DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy.M.d.H.m.s.S");
		zonedDateTime = zonedDateTime.withZoneSameInstant(ZoneId.of("UTC"));
		return df.format(zonedDateTime);
	}

	private static String formatLocal(Date date) {
		final SimpleDateFormat df = new SimpleDateFormat("yyyy.M.d.H.m.s.S", Locale.US);
		return df.format(date);
	}

	private static String formatLocal(ZonedDateTime zonedDateTime) {
		final DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy.M.d.H.m.s.S");
		return df.format(zonedDateTime);
	}

	private String isoDate;
	private ZonedDateTime zonedDateTime;
	private Date date;

	@DependsOn("isoDate")
	public Date getDate() {
		return date;
	}

	@DependsOn("date")
	public String getDateLocal() {
		return Optional.ofNullable(date).map(OldDateVM::formatLocal).orElse(null);
	}

	@DependsOn("date")
	public Long getDateMilliseconds() {
		return Optional.ofNullable(date).map(Date::getTime).orElse(null);
	}

	@DependsOn("date")
	public String getDateUTC() {
		return Optional.ofNullable(date).map(OldDateVM::formatAtUTC).orElse(null);
	}

	public String getIsoDate() {
		return isoDate;
	}

	public String getJavaVendor() {
		return System.getProperty("java.vendor");
	}

	public String getJavaVersion() {
		return System.getProperty("java.version");
	}

	public String getTimezone() {
		return System.getProperty("user.timezone");
	}

	@DependsOn("isoDate")
	public ZonedDateTime getZonedDateTime() {
		return zonedDateTime;
	}

	@DependsOn("zonedDateTime")
	public String getZonedDateTimeLocal() {
		return Optional.ofNullable(zonedDateTime).map(OldDateVM::formatLocal).orElse(null);
	}

	@DependsOn("zonedDateTime")
	public Long getZonedDateTimeMilliseconds() {
		return Optional.ofNullable(zonedDateTime).map(ZonedDateTime::toInstant).map(Instant::toEpochMilli).orElse(null);
	}

	@DependsOn("zonedDateTime")
	public String getZonedDateTimeUTC() {
		return Optional.ofNullable(zonedDateTime).map(OldDateVM::formatAtUTC).orElse(null);
	}

	public String getZoneId() {
		return ZoneId.systemDefault().toString();
	}

	@Init
	public void init() throws ParseException {
		isoDate = "1893-11-01";
		updateDates();
	}

	public void setDate(Date date) {
		this.date = date;
	}

	public void setIsoDate(String isoDate) throws ParseException {
		this.isoDate = isoDate;
		updateDates();
	}

	public void setZonedDateTime(ZonedDateTime zonedDateTime) {
		this.zonedDateTime = zonedDateTime;
	}

	private void updateDates() throws ParseException {
		zonedDateTime = LocalDate.parse(isoDate).atStartOfDay(ZoneId.systemDefault());
		date = new SimpleDateFormat("yyyy-MM-dd").parse(isoDate);
	}
}

<window viewModel="@id('vm') @init('OldDateVM')">
	<vlayout>
		<grid hflex="min">
			<columns>
				<column label="Java Vendor" width="200px" />
				<column label="Java Version" width="190px" />
				<column label="User Time Zone" width="200px" />
				<column label="Zone Id" width="200px" />
			</columns>
			<rows>
				<row>
					<label value="@load(vm.javaVendor)" />
					<label value="@load(vm.javaVersion)" />
					<label value="@load(vm.timezone)" />
					<label value="@load(vm.zoneId)" />
				</row>
			</rows>
		</grid>
		<hlayout valign="middle">
			<label value="ISO 8601 Date" />
			<textbox value="@bind(vm.isoDate)"
				constraint="/\d{4}-\d{2}-\d{2}/" />
		</hlayout>
		<grid hflex="min">
			<columns>
				<column label="Java class" width="210px" />
				<column label="Milliseconds" width="160px" />
				<column label="Local Date Time" width="200px" />
				<column label="ZK JSON format" width="200px" />
				<column label="DateBox (dd/MM/yyyy HH:mm:ss)"
					width="270px" />
			</columns>
			<rows>
				<row>
					<label value="java.time.ZonedDateTime" />
					<label value="@load(vm.zonedDateTimeMilliseconds)" />
					<label value="@load(vm.zonedDateTimeLocal)" />
					<label value="@load(vm.zonedDateTimeUTC)" />
					<datebox
						valueInZonedDateTime="@bind(vm.zonedDateTime)" cols="21"
						format="dd/MM/yyyy HH:mm:ss" buttonVisible="true"
						displayedTimeZones="Europe/Rome" />
				</row>
				<row>
					<label value="java.util.Date" />
					<label value="@load(vm.dateMilliseconds)" />
					<label value="@load(vm.dateLocal)" />
					<label value="@load(vm.dateUTC)" />
					<datebox value="@bind(vm.date)" cols="21"
						format="dd/MM/yyyy HH:mm:ss" buttonVisible="true"
						displayedTimeZones="Europe/Rome" />
				</row>
			</rows>
		</grid>
	</vlayout>
</window>