So below is the steps to change your timezone configuration in Slackware 13.1, you should do these steps as root.
- Change time zone links in /etc: "/etc/localtime-copied-from" to your current timezone in /usr/share/zoneinfo/xxx/xxx (xxx is depends on your timezone area)
# ln -sf /usr/share/zoneinfo/xxx/xxx /etc/localtime-copied-from
- Replace your "/etc/localtime" with your current "/etc/localtime-copied-from"
# cp -rf /usr/share/zoneinfo/xxx/xxx /etc/localtime
- Update your time using ntp server (pool.ntp.org)
# ntpdate pool.ntp.org
# hwclock -w
Isn't it simple? In my opinion this's simple, but sometime we can't do the simplest thing.