Time Zone wrong in Database

Hello :
Today I noticed that the time zone is set wrongly in one of our production instance.
The time is in Mountain standard time instead of Central Standard time. The time zone information is set during database startup through a script.
The script is as follows:
#! /bin/sh
# Name: up_db
TZ=Canada/Central;export TZ
#su - oracle -c "/usr/local/bin/up.oracle.sun db"
su - oracle -c "/usr/local/bin/up_oracle db"
su - oracle -c "lsnrctl start"
Every time the DB is backed up we use down_db script. Once the backup is done. we use the up_db script to start the oracle database. The db was working fine until last backup and today i noitced that the time zone is wrong. Any ideas to fix this issue.
Regards,
BMP

Hi :
We finally found out what was causing this issue. To summarise the issue and the resolution.
Issue:
We had two databases running on the same unix machine. One db was serving the east region and the other one the central region. The Unix machine was running in the Mountain standard Time. So we offset this Change in Time zone by an environmental variable to point exactly to east or Central Time zone. A week ago we noticed that the Central DB is still showing MST. East was running perfect. We were wondering how it is possible for just one db to work properly and the other not.
Observation:
East region was registered dynamically with the local listener and had always picked up the Timezone variable during startup. The central region was registered manually and it always picked up the timezone of the listener in which case it is Mountain. Even though the Time zone variable is set before restart of the DB.
Resolution:
We added the following variable to the SID List (ENVS='TZ=CST6CDT') in the listener.ora for the central DB and restarted the listeners. That fixed the issue for the central region. We disabled dynamic registeration for the east database by pointing the local listener to use a port which is not in use.

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