timekeeping on VM - ntpd running

[Jonathan Garden <jgarden21@xxxxxxxxx>]

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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