If you have time sync problems with Hyper-V Guest Systems there is a simple solution for this.

Problems:

• Time between Server and Active Directory Domain Controller is not correct
• Can’t login because of this
• Can’t add AD Users to local groups

Solution:

To solve this problem you have to disable Time Synchronization in the Hyper-V Integration Services for each guest. Then restart the Windows Time serviceon the guest. The guests will then correctly synchronize with a domain controller.