problem with dates when using a java calendar object with a non-default timezone

Hi,
I am experiencing the following problem with postgresql: the date
value I insert into the database is different from the value I select
from the database. I use a Calendar with a non-default timezone to set
and get the date value (using methods
PreparedStatement.setDate(int,Date,Calendar) and
ResultSet.getDate(int,Calendar)).
Do you know how can I fix this problem? Am I doing anything wrong?
Here is my system configuration:
Server:
OS: Red Hat Linux 7.3
Database: PostgreSQL 7.2
Client:
OS: Windows XP SP2
Java: JDK 1.4.2_05
PostgreSQL JDBC: pg72jdbc2.jar
<http://jdbc.postgresql.org/download/pg72jdbc2.jar> and
pg74.215.jdbc3.jar
<http://jdbc.postgresql.org/download/pg74.215.jdbc3.jar> (the problem
happened in both versions)

I wrote a small Java program that shows the problem. This program is
attached in this email.
Above is the program output when executed in my client system. As
you can see, "date (0) inserted" is different from "date (0) loaded",
"date (2) inserted" is different from "date (2) loaded". This is exactly
the problem. I don't care about the time (hour, minute and second)
difference as this is a SQL DATE type. The problem is that the days in
these dates are different.

//program output start
date (0) inserted: 13/10/04 00:00
date (1) inserted: 13/10/04 23:59
date (2) inserted: 13/10/04 08:00
date (3) inserted: 13/10/04 19:00
date (0) loaded: 12/10/04 17:00
date (1) loaded: 13/10/04 17:00
date (2) loaded: 12/10/04 17:00
date (3) loaded: 13/10/04 17:00
**********************************
=========
hour: 0
minute: 0
second: 0
millisecond: 0
=========
hour: 17
minute: 0
second: 0
millisecond: 0
=========
year1: 2004; month1: 9; date1: 13
year2: 2004; month2: 9; date2: 12
dates equals? false
**********************************
=========
hour: 23
minute: 59
second: 59
millisecond: 999
=========
hour: 17
minute: 0
second: 0
millisecond: 0
=========
year1: 2004; month1: 9; date1: 13
year2: 2004; month2: 9; date2: 13
dates equals? true
**********************************
=========
hour: 8
minute: 0
second: 0
millisecond: 0
=========
hour: 17
minute: 0
second: 0
millisecond: 0
=========
year1: 2004; month1: 9; date1: 13
year2: 2004; month2: 9; date2: 12
dates equals? false
**********************************
=========
hour: 19
minute: 0
second: 0
millisecond: 0
=========
hour: 17
minute: 0
second: 0
millisecond: 0
=========
year1: 2004; month1: 9; date1: 13
year2: 2004; month2: 9; date2: 13
dates equals? true
//program output end

Any help would be much appreciated.

Thanks,
Jair Jr