OpenNTPD

OpenNPTD - Lightweight NTP server ported from OpenBSD

Emerge
Install OpenNTPD:

Service
Start the ntp daemon:

Add the ntp daemon to the default runlevel:

Configuration
The default configuration file for OpenNTPD:

For further information see :

systemd / timedatectl
systemd comes with to manage the system clock time.

The manpage explains how  and  can work together:

However, it also seems to work if is enabled (DEPRECATED, please use  instead as described below)

The time is synced despite the fact that says NTP sync is off:

But in systemd 213 new feature arrived -. It is a built-in NTP client designed as a part of, and the recommended way to sync time with systemd.

External resources

 * http://www.openntpd.org/