Ubuntu automatically selects the timezone based on your current location and allows you to change your timezone during installation.

You can still change the timezone of your Ubuntu system after installation by updating the softlink of /etc/localtime to the correct timezone file in /usr/share/zoneinfo from the terminal.

Steps to change system timezone in Ubuntu:

  1. Launch terminal.
  2. Check currently used timezone using timedatectl.
    $ timedatectl
                   Local time: Jum 2020-08-21 09:30:04 +08   
               Universal time: Jum 2020-08-21 01:30:04 UTC   
                     RTC time: Jum 2020-08-21 01:30:04       
                    Time zone: Asia/Kuala_Lumpur (+08, +0800)
    System clock synchronized: yes                           
                  NTP service: active                        
              RTC in local TZ: no
  3. Check for available timezones in the sysem.
    $ timedatectl list-timezones
    Africa/Abidjan
    Africa/Accra
    Africa/Algiers
    Africa/Bissau
    Africa/Cairo
    Africa/Casablanca
    Africa/Ceuta
    Africa/El_Aaiun
    Africa/Johannesburg
    Africa/Juba
    Africa/Khartoum
    ##### snipped 
  4. Search for your timezone from the list.
    $ timedatectl list-timezones | grep -i tokyo
    Asia/Tokyo
  5. Unlink your currently used timezone.
    $ sudo unlink /etc/localtime
    [sudo] password for user:
  6. Link /etc/localtime to your new timezone.
    $ sudo ln -s /usr/share/zoneinfo/Asia/Tokyo /etc/localtime
  7. Confirm changes using timedatectl.
    $ timedatectl 
                   Local time: Jum 2020-08-21 10:34:29 JST
               Universal time: Jum 2020-08-21 01:34:29 UTC
                     RTC time: Jum 2020-08-21 01:34:29    
                    Time zone: Asia/Tokyo (JST, +0900)    
    System clock synchronized: yes                        
                  NTP service: active                     
              RTC in local TZ: no

Guide compatibility:

Operating System
Ubuntu 16.04 LTS (Xenial Xerus)
Ubuntu 16.10 (Yakkety Yak)
Ubuntu 17.04 (Zesty Zapus)
Ubuntu 17.10 (Artful Aardvark)
Ubuntu 18.04 LTS (Bionic Beaver)
Ubuntu 18.10 (Cosmic Cuttlefish)
Ubuntu 19.04 (Disco Dingo)
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