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Show current state

systemctl status systemd-timesyncd.service
timedatectl
timedatectl -a timesync-status
timedatectl -a show-timesync
cat /etc/systemd/timesyncd.conf

Set NTP servers

sudo mcedit /etc/systemd/timesyncd.conf

Example:

  [Time]
  NTP=ntp.metas.ch ch.pool.ntp.org

ntpdate is deprecated. Install sntp and use that instead:

sudo apt install sntp

sntp pool.ntp.org