urpmi the ntp package
e.g.
urpmi ntp
You DO have your sources set up, right?
See:
http://www.zebulon.org.uk/
Sheez, this should be my tag line... heh.
and
urpmi wizards
now go into the wizards in the MCC and configure your machine as a TIME SERVER.
This will give you the opportunity to select the time sync server it will connect to, as well as adjust how the time is kept vis-a-vis the bios.