Configure Timezone
From LinodeWiki
The tzdata package provides information about the timezones in the world. You should already be grabbing it from testing/unstable or volatile.
[edit] Debian
To correct the timezone in a Debian system use:
tzconfig
Another (maybe a purist) way to do this is:
dpkg-reconfigure tzdata
which will ask you (depending on your debconf settings) for your time zone and configure everything (which actually copies the needed files to /etc/localtime)
[edit] CentOS
Update the ZONE parameter in /etc/sysconfig/clock then run tzdata-update.
ZONE="UTC"
[edit] Others
You can always use:
ln -sf /usr/share/zoneinfo/your/zone /etc/localtime
