I know this has been done to death, but as this is my Blog, and the original idea for it was for me to put all the odds and sods of knowledge in one location so I did not have to remember every little command, I am doing it again.
Hyper-V on Server 2008 and 2008 R2 has a known issue with time slipping slipping slipping into the future (sorry Steve Miller Band moment there) when using a Hyper-V based Primary Domain Controller (PDC). The first part of this is an east step, you turn OFF “Time Synchronisation” for the PDC, or whichever server takes care of your time syncing on the network (although I do it for all servers) on the Hyper-V host, this is done by selecting the Virtual Machine in the Hyper Visor, opening its properties, selecting integration services and unchecking “Time Synchronisation” as shown in the image below
Secondly to that, on the PDC you should set a known reliable time source, I normally select one from http://pool.ntp.org.
To add this sever and set it to your PDC time server open an Administrative Command Prompt and enter the following commands
net stop w32time
w32tm /config /manualpeerlist:PEERS /syncfromflags:manual /reliable:yes /update
net start w32time
Where PEERS is the selected time server or time server pool.
This should update itself instantly, and keep itself updated