Set Timezone on Arch Linux

See your system's current timezone

$ timedatectl status
               Local time: Mon 2022-06-20 16:05:34 CST
           Universal time: Mon 2022-06-20 08:05:34 UTC
                 RTC time: Mon 2022-06-20 08:05:34
                Time zone: Asia/Taipei (CST, +0800)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

Change the timezone

$ sudo timedatectl set-timezone Asia/Taipei

You can verify that timedatectl has done the right thing by inspecting the /etc/localtime symlink:

$ ls -l /etc/localtime
lrwxrwxrwx 1 root root 33 Jun 20 10:06 /etc/localtime -> ../usr/share/zoneinfo/Europe/Oslo

timedatectl doesn't update /etc/timezone for some reason, so I edit that manually with:

# vim /etc/timezone

View all available timezones

If you don't know what the timezone string is called, you should have TAB completion, if this hasn't been enabled on your system, you can have a look at all the available ones with:

$ timedatectl list-timezones