changing time zone....

"System" <[email protected]> Fri, 11 Jul 2003 11:11:23 +0530

Newsgroups	gmane.linux.redhat.release.enigma
Message-ID	<009201c3476f$125554f0$1a01a8c0@vishal>

How do I change the time from EDT to EST?

Thank you,
Tina...