A new update is available for Fedora Core - Fedora Core 4 Update: tzdata-2005r-3.fc4. Here the announcement:

Fedora Update Notification
FEDORA-2006-018
2006-01-09
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Product : Fedora Core 4
Name : tzdata
Version : 2005r
Release : 3.fc4
Summary : Timezone data
Description :
This package contains data files with rules for various timezones around
the world.

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* Mon Jan 9 2006 Petr Machata <pmachata@redhat.com> 2005r-3.fc4
- 2005r-2
- Meta changes. Renaming tzdata.tar.bz2 file to tzdata$ver-base,
so that it won't clash across updates.

* Thu Jan 5 2006 Petr Machata <pmachata@redhat.com> 2005r-1.fc4
- 2005r
- Zones EST, MST, HST, EST5EDT, CST6CDT, MST7MDT, PST8PDT moved to
northamerica to guard against old files with obsolete information
being left in the time zone binary directory.
- Changes for countries that are supposed to join 2007 US DST
change. This includes most of Canada, however entries already in
the database (Alberta, British Columbia, Newfoundland, Northwest
Territories, and Yukon) were left alone for the time being.
- Fixes in zdump.c (abbrok): conditions are chained, and the string
is checked for emptiness.

* Sat Dec 17 2005 Jakub Jelinek <jakub@redhat.com> 2005q-2
- 2005q
- changes for Georgia, Azerbaijan, Jordan, Palestine, Cuba, Nicaragua
- SystemV timezone changes


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This update can be downloaded from:
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/4/

6ea5e7bcdf1ca3fc3de8607888411c80 SRPMS/tzdata-2005r-3.fc4.src.rpm
6954ed0b422fea36578b9a0728b6e682 x86_64/tzdata-2005r-3.fc4.noarch.rpm
6954ed0b422fea36578b9a0728b6e682 i386/tzdata-2005r-3.fc4.noarch.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the 'up2date' command.