1. Check the current time zone:
# cat /etc/sysconfig/clock
ZONE="America/New_York"
# date
Thu Jul 9 06:46:14 EDT 2013
2. You can find the list of available time zones under /usr/share/zoneinfo:
# ls /usr/share/zoneinfo
Africa Atlantic Chile Eire Factory GMT-0 Iceland Jamaica Mexico NZ posix ROC Universal zone.tab
America Australia CST6CDT EST GB GMT+0 Indian Japan Mideast NZ-CHAT posixrules ROK US Zulu
Antarctica Brazil Cuba EST5EDT GB-Eire Greenwich Iran Kwajalein MST Pacific PRC Singapore UTC
Arctic Canada EET Etc GMT Hongkong iso3166.tab Libya MST7MDT Poland PST8PDT Turkey WET
Asia CET Egypt Europe GMT0 HST Israel MET Navajo Portugal right UCT W-SU
# ls /usr/share/zoneinfo/Europe/
Amsterdam Berlin Chisinau Helsinki Kiev Madrid Moscow Prague Sarajevo Tallinn Vatican Zagreb
Andorra Bratislava Copenhagen Isle_of_Man Lisbon Malta Nicosia Riga Simferopol Tirane Vienna Zaporozhye
Athens Brussels Dublin Istanbul Ljubljana Mariehamn Oslo Rome Skopje Tiraspol Vilnius Zurich
Belfast Bucharest Gibraltar Jersey London Minsk Paris Samara Sofia Uzhgorod Volgograd
Belgrade Budapest Guernsey Kaliningrad Luxembourg Monaco Podgorica San_Marino Stockholm Vaduz Warsaw
3. Change it to your desired time zone:
# vi /etc/sysconfig/clock
ZONE="Europe/Berlin"
4. Create a backup of current localtime file and create a new one as a symbolic link to the zone file:
# mv /etc/localtime /etc/localtime.old
# ln -sf /usr/share/zoneinfo/Europe/Berlin /etc/localtime
# ls -l /etc/localtime*
5. Time zone has been changed now:
# cat /etc/sysconfig/clock
ZONE="Europe/Berlin"
# date
Thu Jul 9 12:59:39 CEST 2013
But you can reboot the server in order for other applications running on the server use the new time zone.
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