How to configure the Windows Time Service on the first forest root Domain Controller.
At the command line, type:
W32tm /config /manualpeerlist:<peers> /syncfromflags:manual
Where <peers> is a space–delimited list of DNS and/or IP addresses. When specifying multiple peers, enclose the list in quotation marks.
Update the Windows Time Service configuration. At the command line, type:
W32tm /config /update
– or –
Net stop w32time && Net start w32time
Note: When specifying a manual peer, do not use the DNS name or IP address of a computer that uses the forest root domain controller as its source for time, such as another domain controller in the forest. The time service will not operate correctly if there are cycles in the time source configuration.