netdate

Set Date and Time by ARPA Internet RFC 868

Netdate takes a list of names of Internet hosts as arguments, selects the one that supplies the best time, and sets the system time accordingly. The "best" time is chosen by polling the named hosts once each to find their times and taking their differences from the local host's time. These differences are used to find the largest group of hosts whose times agree with each other within a certain limit. The first host in the largest group is picked as the best host.