private String formatYear(UTCDate newDate) {
        final FormatOptions yearFormat = FormatOptions.builder().year(Year.NUMERIC).build();
        return IntlDateTimeFormat.format(newDate, IntlDateTimeFormat.DEFAULT_LOCALE, yearFormat);
    }
Returns the ListBox for selecting the year
stroom-core-client-widget/src/main/java/stroom/widget/datepicker/client/DefaultMonthSelector.java