Ubuntu 20.04 Set Timezone

List Time Zones in America:
# timedatectl list-timezones | grep America
…
America/Los_Angeles

Set time zone to US Pacific:
# timedatectl set-timezone America/Los_Angeles

Show time zone settings:

root@ConfigNotes:~# timedatectl
               Local time: Sun 2021-02-14 20:26:57 PST
           Universal time: Mon 2021-02-15 04:26:57 UTC
                 RTC time: Mon 2021-02-15 04:26:58
                Time zone: America/Los_Angeles (PST, -0800)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no