kazulog@sv1:~$ date
Thu Sep 10 23:23:42 UTC 2026
kazulog@sv1:~$ sudo timedatectl set-timezone Asia/Tokyo
kazulog@sv1:~$ date
Fri Sep 11 08:23:42 JST 2026
kazulog@sv1:~$ timedatectl
               Local time: Fri 2026-09-11 08:23:42 JST
           Universal time: Thu 2026-09-10 23:23:42 UTC
                 RTC time: Thu 2026-09-10 23:23:42
                Time zone: Asia/Tokyo (JST, +0900)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no
kazulog@sv1:~$ ls -l /etc/localtime
lrwxrwxrwx 1 root root 32 Sep 11 08:23 /etc/localtime -> ../usr/share/zoneinfo/Asia/Tokyo
kazulog@sv1:~$ cat /etc/timezone
Asia/Tokyo