The timezone under Linux is set by a symbolic link from
/etc/localtime to a file in the
/usr/share/zoneinfo directory that corresponds with what timezone you are in. For example, since I'm in South Australia,
/etc/localtime is a symlink to
/usr/share/zoneinfo/Australia/South. To set this link, type:
ln -sf ../usr/share/zoneinfo/your/zone /etc/localtime
your/zone with something like
Australia/Perth. Have a look in the directories under
/usr/share/zoneinfo to see what timezones are available.
 This assumes that
/usr/share/zoneinfo is linked to
/etc/localtime as it is under Red Hat Linux.
 On older systems, you'll find that
/usr/lib/zoneinfo is used instead of
/usr/share/zoneinfo. See also the later section ''.