Calendar Question - maybe bug ?

[Heiko Weber]

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.

Heiko