$ timedatectl
               Local time: Thu 2022-08-04 13:26:58 UTC
           Universal time: Thu 2022-08-04 13:26:58 UTC
                 RTC time: n/a
                Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

$ timedatectl set-timezone Asia/Tokyo
==== AUTHENTICATING FOR org.freedesktop.timedate1.set-timezone ===
Authentication is required to set the system timezone.
Authenticating as: Ubuntu (ubuntu)
Password:
==== AUTHENTICATION COMPLETE ===

$ timedatectl
               Local time: Thu 2022-08-04 22:27:36 JST
           Universal time: Thu 2022-08-04 13:27:36 UTC
                 RTC time: n/a
                Time zone: Asia/Tokyo (JST, +0900)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no