rcntp ntptimeset     #Zeit mit NTP-Server synchroniseren (SLES legacy)
ntpq -p              #show peers
timedatectl
sudo timedatectl set-ntp true
sudo timedatectl set-local-rtc 0
systemctl status systemd-timesyncd
sudo systemctl restart systemd-timesyncd

timedatectl  status
timedatectl list-timezones |  egrep  -o "Europe/B.*"
sudo timedatectl set-timezone "Europe/Berlin"

chrony.conf

server 192.168.1.1
allow 10.1.0.0/16
allow 192.168.1.0/24

chronyc activity
chronyc 'burst 4/4'   # might interrupt services
chronyc -N sources