Disconnect Local Clock from Domain Controller Clock
How can I disconnect my workstation clock from the domain controller?
In other words, I do not want them synchronized.
You can stop the windows time service, this will prevent the computer from being able to sync with the domain controller. You can disable this service if you need it to not sync over a number of reboots.
I would warn against doing this for a long period of time however, as if your local clock gets out of sync with the domain controllers time, you will have problems logging on.