Fedora defaulted the NTP client to chrony
around Fedora 16. So, no more classical ntp
unless you install it manually.
Documentation for chrony can be found with man chronyd
for the daemon (client) and man chronyc
for the users' command line tool.
Config file is: /etc/chrony.conf
More information can be found in [the developers documentation].(http://chrony.tuxfamily.org/documentation.html)
In your case, run chronyc sources
to see whether your client identifies some sources, and chronyc refresh
to sync with one of the sources. If that fails, check if the daemon is active systemctl status chronyd
.