Calendar Question - maybe bug ?

[Achilleus Mantzios]

O Heiko Weber έγραψε στις May 30, 2006 :

> Am Dienstag, 30. Mai 2006 08:19 schrieb Panagiotis Astithas:
> > Heiko Weber wrote:
> > > Hi !
> > >
> > > I've a problem with GregorianCalendar, which returns different weeks (in
> > > year) on FreeBSD 6.1, java version is
> > >
> > > # java -version
> > > Java HotSpot(TM) Server VM (build 1.5.0-p2-heiko_03_jan_2006_23_51, mixed
> > > mode)
> > >
> > > Test program (A.java):
> > >
> > > import java.util.Calendar;
> > > import java.util.GregorianCalendar;
> > >
> > > public class A {
> > > public static int weeksInYear(int year) {
> > >                 Calendar cal = GregorianCalendar.getInstance();
> > >
> > >                 cal.set(year, 11, 31);
> > >
> > >                 return cal.get(Calendar.WEEK_OF_YEAR) == 53 ? 53 : 52;
> > >         }
> > >
> > >         public static void main(String args[]) {
> > >                 for (int i = 1990; i <= 2006; i++)
> > >                         System.out.println("Weeks in Year " + i + " = " +
> > > weeksInYear(i));
> > >         }
> > > }
> > >
> > > Output on a Linux or Windows JRE is:
> > >
> > > Weeks in Year 1990 = 52
> > > Weeks in Year 1991 = 52
> > > Weeks in Year 1992 = 53
> > > Weeks in Year 1993 = 52
> > > Weeks in Year 1994 = 52
> > > Weeks in Year 1995 = 52
> > > Weeks in Year 1996 = 52
> > > Weeks in Year 1997 = 52
> > > Weeks in Year 1998 = 53
> > > Weeks in Year 1999 = 52
> > > Weeks in Year 2000 = 52
> > > Weeks in Year 2001 = 52
> > > Weeks in Year 2002 = 52
> > > Weeks in Year 2003 = 52
> > > Weeks in Year 2004 = 53
> > > Weeks in Year 2005 = 52
> > > Weeks in Year 2006 = 52
> > >
> > > Output on FreeBSD is:
> > >
> > > Weeks in Year 1990 = 52
> > > Weeks in Year 1991 = 52
> > > Weeks in Year 1992 = 52
> > > Weeks in Year 1993 = 52
> > > Weeks in Year 1994 = 53
> > > Weeks in Year 1995 = 52
> > > Weeks in Year 1996 = 52
> > > Weeks in Year 1997 = 52
> > > Weeks in Year 1998 = 52
> > > Weeks in Year 1999 = 52
> > > Weeks in Year 2000 = 52
> > > Weeks in Year 2001 = 52
> > > Weeks in Year 2002 = 52
> > > Weeks in Year 2003 = 52
> > > Weeks in Year 2004 = 52
> > > Weeks in Year 2005 = 53
> > > Weeks in Year 2006 = 52
> > >
> > > Is this my fault or would it help to update the FreeBSD JRE ? Or is the
> > > java-Calendar-System build up on some local (changeable) settings ?
> > >
> > > Thanks for any help or hint.
> >
> > I can't replicate this here on either diablo-jdk15 or jdk15 patchset 2
> > (as yours). Is your systems time/timezone/etc. correct?
> >
> 
> Hm, /etc/localtime has been installed last year in september - from 
> installation of FreeBSD 6.0. If I remember correct I used sysinstall and 
> answered "cmos time == local time".
> 
> # date
> Tue May 30 09:48:36 CEST 2006
> 
> Is this ok for germany ?

I think yes, it means Central European Time (CET) with saylight savings 
(S).

Applying 
--- A.java.old  Tue May 30 12:57:28 2006
+++ A.java      Tue May 30 12:57:37 2006
@@ -11,6 +11,7 @@
          }

          public static void main(String args[]) {
+                java.util.TimeZone.setDefault(null);
                  for (int i = 1990; i <= 2006; i++)
                          System.out.println("Weeks in Year " + i + " = " 
+ weeksInYear(i));
          }

Should give you a hint of whether the problem is TZ related.

P.S.
Also with 1.4.2 I get the first result set.

> 
> At the moment I compile jdk with patchset 3 on an other FreeBSD system to 
> verify ... there I can play with the timezone settings after installation.
> 
> Thanks for the hint.
> 
>   Heiko
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-- 
-Achilleus