[CentOS] timekeeping on VM - ntpd running

This is really stupid question. But referring to:
http://lists.centos.org/pipermail/centos/2009-October/083791.html
I don't see any line related to ntpd in my /var/log/messages . Do I need to
turn-on ntpd for timekeeping on VMs? Some people say not to use ntpd on VMs
for timekeeping or is it ntpdate cron job? Can someone please elaborate on
this?

Thanks,
Jonathan.
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