A new update is available for Fedora Core - Fedora Core 4 Update: tzdata-2005m-1.fc4. Here the announcement:

Fedora Update Notification
FEDORA-2005-856
2005-09-07
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Product : Fedora Core 4
Name : tzdata
Version : 2005m
Release : 1.fc4
Summary : Timezone data
Description :
This package contains data files with rules for various timezones around
the world.

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* Tue Sep 6 2005 Jakub Jelinek <jakub@redhat.com> 2005m-1.fc4
- 2005m
- changes for USA (extending DST by 4 weeks since 2007), Tunisia,
Australia, Kazakhstan
- historical timezone data changes for Japan, Poland, Northern Ireland and
Mali
- timezone name change for East Timor

* Fri Jul 15 2005 Jakub Jelinek <jakub@redhat.com> 2005k-2
- 2005k
- leap seconds update


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

f12c1fb4b07f512375bbead63e0d5312 SRPMS/tzdata-2005m-1.fc4.src.rpm
59662a764ef75599154ad16f26890866 x86_64/tzdata-2005m-1.fc4.noarch.rpm
59662a764ef75599154ad16f26890866 i386/tzdata-2005m-1.fc4.noarch.rpm

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