If you're still running Red Hat or Fedora Linux systems that were being updated by the Fedora Legacy project before it was shut down, you should have received the tzdata update last year to correct the Daylight Saving Time switchover for this year. However, the updates from fedoralegacy.org only installed the new /usr/share/zoneinfo files, but didn't update /etc/localtime from that. (On RH/FC systems, /etc/localtime is a copy of the appropriate zoneinfo file, not a symbolic link.)
What I found is that for these systems (RH9, FC1-3), I needed to do the following:
cp -p /usr/share/zoneinfo/America/Winnipeg /etc/localtime
After that, I either rebooted the system, or restarted these services: syslog, crond, xinetd, sendmail, httpd. FC4 updated itself automatically last spring, so as long as you rebooted since then, the DST change should have happened without a snag. FC5-6 had the changes at release time.
I also managed to update a very old Red Hat 6.2 system by copying the zoneinfo file from a Red Hat 9 system updated by fedoralegacy.
Just thought these tips might be of help if you're supporting legacy linux boxes.