We figured the problem out.
Our older version did not have the OS patch:
http://www.postgresqlforums.com/wiki/2007_Daylight_Savings_Time
________________________________________
From: pgsql-hackers-owner@postgresql.org
[mailto:pgsql-hackers-owner@postgresql.org] On Behalf Of Dann Corbit
Sent: Wednesday, March 12, 2008 6:06 PM
To: pgsql-hackers@postgresql.org
Cc: Larry McGhaw
Subject: [HACKERS] TIMESTAMP and daylight savings time question
It appears that the older versions of PostgreSQL (7.x) do not consider
the daylight savings time when using TIMESTAMP WITH TIMEZONE but the
most recent versions do (8.x).
Can someone tell me the exact PostgreSQL version number where the
behavior changed?
