OpenNTPD

OpenNTPD is NTP server ported from OpenBSD.]]

Emerge
Install OpenNTPD:

Service
To ask OpenNTPD to attempt clock sync on startup, edit :

Note that if the clock drift is sufficiently large, you may first need to set the time manually using.

OpenRC
Start the ntp daemon:

Add the ntp daemon to the default runlevel:

systemd
To enable and start the service now:

Configuration
The default configuration file for OpenNTPD:

For further information see the man page:

Client
Alternatively sync the client to a server on the local network:

Checking the daemon operation
provides the program to display information about the running  daemon:

The output shows how many servers the daemon is syncing with, the status of the system clock (synced/unsynced) and the clock offset. For further information see the man page: