Set the timezone permanently in Redhat Linux -
Google this and you'll probably find guides telling you to do things like create a symlink from /etc/localtime, pointing to /usr/share/zoneinfo/.

That is correct, and works nicely, until you run up2date and one of the packages you upgrade happens to revert the system back to your previous timezone.

The trick is to edit /etc/sysconfig/clock and make sure that there's a line saying:

ZONE="GMT"
(substitute the timezone you wish to use for GMT).

Now it's really permanent.
-Jonesy