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FULL PRODUCT VERSION : java version "1.5.0_10" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03) Java HotSpot(TM) Client VM (build 1.5.0_10-b03, mixed mode, sharing) Also repeatable on: 1.5.0_08 1.5.0_09 1.6.* Regression: it works on 1.5.0_07 and earlier. ADDITIONAL OS VERSION INFORMATION : Microsoft Windows XP [Version 5.1.2600] Linux expo 2.6.8-3-686 #1 Tue Dec 5 21:26:38 UTC 2006 i686 GNU/Linux A DESCRIPTION OF THE PROBLEM : Method TimeZone.inDaylightTime(Date) returns false for any argument. STEPS TO FOLLOW TO REPRODUCE THE PROBLEM : Compile and run the source code. EXPECTED VERSUS ACTUAL BEHAVIOR : EXPECTED - Output: date: 2005-01-01; dst=false date: 2005-07-01; dst=true ACTUAL - date: 2005-01-01; dst=false date: 2005-07-01; dst=false REPRODUCIBILITY : This bug can be reproduced always. ---------- BEGIN SOURCE ---------- import java.text.*; import java.util.*; public class tztest { private static final DateFormat format = new SimpleDateFormat("yyyy-MM-dd"); private static final TimeZone tz = TimeZone.getTimeZone("EST"); public static void main(String[] args) throws ParseException { check("2005-01-01"); check("2005-07-01"); } private static void check(String s) throws ParseException { Date date = format.parse(s); System.out.println("date: " + s + "; dst=" + tz.inDaylightTime(date)); } } ---------- END SOURCE ----------