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/etc/systemd: Included files
Time synchronization settings (timesyncd.conf)
This file configures the systemd-timesyncd.service and allows for a very simple NTP-sync setup. Edit the NTP= line with a space-delimited list of your desired timeservers. In the event those timeservers are not available, you can configure backup servers by listing them on the FallbackNTP= line, again space delimited.
I've set the defaults in this file to be the worldwide NTP.org servers. This should work for pretty much anyone that uses this file, but you really should customize the list to use geographically closer timeservers (check out the list here) or the timeserver on your LAN, etc.
When you're done editing this file, make sure you restart the timesyncd service and check it's status to verify it is now using one of your defined NTP servers.
systemctl restart systemd-timesyncd.service && systemctl status systemd-timesyncd.service
Finally, you can confirm things are working properly by running timedatectl.
timedatectl
You should see the correct time listed and NTP synchronized: yes.