Any kind of *nix or operating system that has it's roots in unix is welcome. This also includes free and open source applications as well but also can include proprietary and commercial software used in support of *nix systems.
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Unix, GLIBC and DST oh my!
Most if not all GNU/Linux systems use the GNU Libc for their C Standard Library. Somewhere around glib 2.3 release (2000) library code was modified in all time and date calculations routines to utilize the host systems tzdata file (normally /etc/localtime). In Redhat this happened roughly at release 7.0. What this means if you are unable to obtain fixes for your Linux system you can always download the latest tzdata file (see my procedure at http://www.kevininscoe.com/pub/howtos/applying_dts_changes_to_redhat.txt) and using the Zone Compiler (zic) apply to the system without a reboot. However if your unix system is using a GLIBC older than 2.3 or is not using glib at all you may have a concern on your hands. One way to tell if you system is using the corrected tzdata without rebooting it is to issue the command:
$ date -d '1970-01-01 UTC +1173679260 seconds'
If you see April 1 then indeed your C Library is ignoring tzdata.
Mon Mar 12 01:01:00 EST 2007