Setting Default Time Zone In Select Form

I have the task which should set the default time zone in the select form. For this aim I use SimpleTimeZone class and write simple test to check my code. It is below

Java Code:

@Test
public void defaultTimeZone() {
String def = SimpleTimeZone.getDefault().getID();
boolean has = false;
for (String id : SimpleTimeZone.getAvailableIDs()) {
System.out.println(id);

[Code] ....

It works perfectly on win 7 and ubuntu, but falls on win xp. I know that win xp is not supported more but I still have some customers who use it.