Why won't my Windows Systems Keep the right time? Maybe it's a VMware setting??

I could not add user to local admin group on aW2K8 Member Server.  Kept getting system error 5 time sync.
Found that server was authenticating with DC2 whose time was not in sync with DC1, so AD replication was degraded.  Reset time on DC2 but it kept reverting to a different time. 

Did I mention these are Virtual Servers on VmWare?

Found that DC2 was set in VM tool options to get time from VmWare host not DC1.  Fixed that and fixed replication and then was able to add users to local admin group on W2K8 server.