I have been dealing with a time sync error for awhile. I have tried removing the time service and re-adding it, I can not get my DC to move off LOCAL CMOS at the source for sync and for some reason the time changes without me doing it, today it jumped
a hour back.

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Try windows time debug logging;

http://blogs.msdn.com/b/w32time/archive/2008/02/28/configuring-the-time-service-enabling-the-debug-log.aspx


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Hi,

Generally, the third party security software, such as antivirus program and firewall may cause such issue. You may disable them to check the result.

In addition, you may perform the following commands to manually synchronize time:

1. "net stop w32time".
2. "w32time –update"
3. "net start w32time"
4. Optional Stage - "dsquery server -hasfsmo pdc" - The result will reflect if the client find the PDC (or PDC Emulator) server.
5. Check the System event log to ensure that the W32Time service has not logged additional error messages.

If it does not work, I also would like to suggest you try the Microsoft “Fix it” tool to reconfigure an authoritative time server from the
following link:

http://support.microsoft.com/kb/816042


Regards,Arthur Li
TechNet Community Support

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Check these below blogs.
1.
Configuring the Windows time service for Windows Server by ACE
2.
Time Configuration in a Windows Domain

In addition to Arthur Li, I suggest you post in AD forum.

http://social.technet.microsoft.com/forums/en-US/winserverDS/threads/


Thanks

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