DateTimeFormat - No support for Buddhist calendar?

Our users require dates to be input and displayed using the Buddhist calendar - where the year is 543 years greater than the Gregorian calendar.

In normal Java, the following works:

Locale locale = new Locale("th", "TH");
DateFormat dateFormat = new SimpleDateFormat("EEEE dd/MM/yyyy", locale);
System.out.println("Date is: " + dateFormat.format(new Date()));

which outputs

Date is: วันจันทร์ 28/02/2554

This is the result we require.

Trying the equivalent in GWT, I set the locale to "th_TH", and ran the following code:

DateTimeFormat dateFormat = DateTimeFormat.getFormat("EEEE dd/mm/yyyy");
System.out.println("Date is: " + dateFormat.format(new Date()));

which outputs

Date is: วันจันทร์ 28/02/2011

ie the year is incorrect (2011, should be 2554).

It appears that the DateTimeFormat class does not support the +543 year offset required for the Buddhist calendar. I've tried looking through the GWT source + generated code, and it appears that this is the case.

Is this a deficiency of the DateTimeFormat class, or am I missing a trick?

Thanks.

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