Time was not correct on dc which is hyper-v virtual machine

My enviroment:
1 physical server dell R720
Role: Hyper-V host
OS: Windows 2008 R2 SP1
Domain: join to domain xx.com
1 virtual machine
Role: DC+DNS+DHCP
OS: Windows 2008 R2 SP1
Domain: xx.com (olny one dc)
Located on: this hyper-v host
Issue:
I found time of virtual machine (this only one dc) was slower than current time. At that moment, time on host machine also slower, and same as dc. When I manual adjust this time to correct. It would go wrong again.
Considering time sync rule of domain and hyper-v, I just unchecked 'Time Synchoniation' on hyper-v intergrate services. Howerver time was slower again after few days.
Could it be possible wrong on hyper-v host which join to domain??
So could you give me some suggestion for this? Thanks in advance. 

Hi,
You should not need to disable Hyper-V time synchronization in order to use a different time synchronization source.
" if you are running a Domain Controller inside a virtual machine I would recommend that you leave Hyper-V time synchronization enabled but that you also setup an external time source.  You can do this by going to this KB article:
http://support.microsoft.com/kb/816042 and following the steps outlined in the “Configuring the Windows Time service to use an external time source” section. "
Here is a grate article about time synchronization in hyper-v :
http://blogs.msdn.com/b/virtual_pc_guy/archive/2010/11/19/time-synchronization-in-hyper-v.aspx
Hope it helps
Best Regards
Elton Ji
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