Time services

Links

NTP

Linux implementations

systemd

systemctl status systemd-timesyncd

timedatectl status

man timesyncd.conf

FAQ

Address family not supported by protocol

Try setting IPv4 address in /etc/systemd/timesyncd.conf

timesyncd

documentation

FAQ

ntpdate: no servers can be used

you need to pass a server

Force IPv4 only

In ntpd.service

ExecStart=/usr/bin/ntpd -4 -g -u ntp:ntp

Or remove the 2.* lines from /etc/systemd/timesyncd.conf