Windows DST Patches/workaround:

Windows 2000 Server: http://support.microsoft.com/kb/914387
Windows 2003 Server: http://support.microsoft.com/kb/931836

Red Hat Linux DST Patches/workaround: May work with other linux.

zdump –v /etc/localtime |grep –i 2007
if shows March 11 you are okay
If shows April 1, then

system-config-date
select chicago

if that is not available then run
up2date –i tzdata

(if you can’t do this then just keep going and follow the last step)

then run
system-config-date again
select chicago

If that doesn’t work then

backup /etc/localtime
cp /usr/share/zoneinfo/US/Central /etc/localtime

then edit /etc/sysconfig/clock and replace whatever you had for time zone to:
ZONE="America/Chicago"

then check it again.

If this doesn’t work then, just copy the Central from any other linux box since the one you have maybe outdated.

* You might also be able to update DST change by using the "zic" method described in the "DST Patch/Workaround for ESX"

* Info provided by Steve Turner and Will Sellers