Hi
I am trying to get to grips with Java Calendar class (and the TimeZone
class). I have noted some very weird behaviour though:
Try the following:
1) Bring up the Date and Time Properties window in Windows XP and
select the timezone (GMT -03:00) Montevideo. Leave the DST box
unchecked, click Apply. Now run the application code seen at the
bottom of this post. Note in Java output how Java identifies the
timezone as "GMT-03:00" and also outputs the time as being the same as
the Windows OS time. Correct behaviour according to me!
2) Click to check the DST box and then click Apply. Now run the
application code seen at the bottom of this post again. Note in Java
output that Java identifies the timezone as "GMT" and also outputs the
time as being 3 hours more than it was when using DST. Java's time is
now not correlated with Windows time.
WHAT IS GOING ON HERE???
Montevideo has got +1 hour DST time, not 3 hours. And how can Java
identify it as GMT when it really should be GMT-3. Montevideo is not
the only timezone that is identified as "GMT" when DST is enabled. For
example also "(GMT+04:00) Baku" and "(GMT+02:00) Beirut" are also
identified as "GMT" when DST is enabled.
I am confused by Java time management to say the least. If anyone has
any idea of what is going on here I would really appreciate some help.
public class TimeTestMain {
public static void main(String[] args) {
test();
}
private static void test(){
Calendar cal = Calendar.getInstance();
TimeZone tz = cal.getTimeZone();
System.out.println("TimeZone info: " + tz);
System.out.println("time in " + tz.getDisplayName() + " is: " +
cal.getTime().toString());
}
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