[fedora-java] Java time zone bug wrt GB/Eire zone?

[Joe Desbonnet]

Just when I thought I really understood the Java time API this test
case below threw me today. Same results with the current FC6 Java
stack (up to date) and Sun JDK (1.5.0_07).

Why oh why is 17:00 UK/Irish local time the same as 17:00 UTC ? The
local time should be one hour ahead due to daylight savings.? Funny -
I wrote lots of code last year relating to logging sensor data and I
had no problems normalizing the timestamps to UTC. Now I just can seem
to do it. A bug in Java timezone files or my brain?

import java.util.Date;
import java.util.TimeZone;
import java.text.SimpleDateFormat;
public class DateTest {

	public static void main (String arg[]) throws Exception {
		TimeZone localTz = TimeZone.getTimeZone ("GB/Eire");
		SimpleDateFormat localDateFormat = new SimpleDateFormat ("yyyyMMdd HH:mm:ss");
		localDateFormat.setTimeZone(localTz);

		TimeZone utcTz = TimeZone.getTimeZone ("UTC");
		SimpleDateFormat utcDateFormat = new SimpleDateFormat("yyyyMMdd HH:mm:ss");
		utcDateFormat.setTimeZone(utcTz);

		String datetime = "20070417 17:00:00";

		Date d1 = localDateFormat.parse(datetime);
		Date d2 = utcDateFormat.parse(datetime);

		if (d1.getTime() == d2.getTime()) {
			System.err.println ("Error: GB/Eire = UTC + Daylight Savings (ie
d1-d2 = 1 hour, not 0 hour)");
		}
	}
}