Debian timesyncd

As an alternative to setting up ntp, debian comes with preconfigured systemd time support.

systemctl status systemd-timesyncd
systemd-timesyncd.service - Network Time Synchronization
     Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2021-09-11 10:10:59 CEST; 4 days ago
       Docs: man:systemd-timesyncd.service(8)
   Main PID: 486 (systemd-timesyn)
     Status: "Initial synchronization to time server [2a01:4f9:2b:f20:123:123:123:123]:123 (2.debian.pool.ntp.org)."
      Tasks: 2 (limit: 4558)
     Memory: 1.1M
        CPU: 538ms
     CGroup: /system.slice/systemd-timesyncd.service
             └─486 /lib/systemd/systemd-timesyncd

timedatectl
               Local time: Wed 2021-09-15 12:45:13 CEST
           Universal time: Wed 2021-09-15 10:45:13 UTC
                 RTC time: Wed 2021-09-15 10:45:14
                Time zone: Europe/Berlin (CEST, +0200)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no