I’ve got the same problems as described here:
Synchronize Clock With Ntp On Boot - openSUSE Forums
with starting the ntp daemon on startup.
Basically, ntpd is started on the same moment when knetworkmanager is started, which leads to the problem that ntpd can’t find any servers due to the network not available yet.
In the link above there is a workaround described with setting ntpd to start manually in yast and edit /etc/init.d/boot.local to start ntpd after 5 minutes.
Is this still “state of the art” ? Or has the issue been fixed somewhere else and I’m doing something wrong ?