systemctl restart  systemd-timesyncd
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 Sun 2018-11-25 11:29:00 CET; 1s ago
     Docs: man:systemd-timesyncd.service(8)
 Main PID: 16475 (systemd-timesyn)
   Status: "Synchronized to time server 192.53.103.108:123 (ptbtime1.ptb.de)."
    Tasks: 2 (limit: 2319)
   CGroup: /system.slice/systemd-timesyncd.service
           └─16475 /lib/systemd/systemd-timesyncd

Nov 25 11:29:00 backup systemd[1]: Starting Network Time Synchronization...
Nov 25 11:29:00 backup systemd[1]: Started Network Time Synchronization.
Nov 25 11:29:01 backup systemd-timesyncd[16475]: Synchronized to time server 192.53.103.108:123 (ptbtime1.ptb.de).