[Bug classpath/27343] New: Calling java.util.Calendar#setTimeZone() does not force recalculation of calendar fields

[kiyun dot roe at active-endpoints dot com]

The Calendar implementation does not recalculate its fields when the time zone
changes. This leads to behavior where the time zone changes, but the hour of
the day doesn't. Here is a little test case that demonstrates the problem.

public class CalendarSetTimeZoneTest extends TestCase
{
   public void testCalendarSetTimeZone()
   {
      java.util.Calendar cal = java.util.Calendar.getInstance();
      cal.setTimeZone(java.util.TimeZone.getTimeZone("GMT+0"));
      cal.setTime(new java.util.Date());
      int hour1 = cal.get(java.util.Calendar.HOUR_OF_DAY);
      cal.setTimeZone(java.util.TimeZone.getTimeZone("GMT-5"));
      int hour2 = cal.get(java.util.Calendar.HOUR_OF_DAY);
      int delta = (hour1 - hour2 + 24) % 24;
      assertEquals(delta, 5);
   }
}


-- 
           Summary: Calling java.util.Calendar#setTimeZone() does not force
                    recalculation of calendar fields
           Product: classpath
           Version: 0.90
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: classpath
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kiyun dot roe at active-endpoints dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27343