So I've tried the trick from Virtual PC 2007, adding the following section to the vmc configuration file:
<components> <host_time_sync> <enabled type="boolean">false</enabled> </host_time_sync> </components>
Later someone suggested VPC doesn't want the components level so added this instead:
<host_time_sync> <enabled type="boolean">false</enabled> <frequency type="integer">15</frequency> <threshold type="integer">10</threshold> </host_time_sync>
When I start up XP Mode (Microsoft Virtual PC) it completely ignores any of these two configuration changes and if I change the clock it's instantly reset to the host time again. I've also obviously disabled the Windows Time service but as it's not joined to a domain or set up with a source it shouldn't be involved anyway.
I need to test an application over a few midnight passes and thought the XP Mode machine would be perfect, so I didn't have to mess with my workstation clock... is there any way to get the VPC guest to not sync time with the host? This is easy in Hyper-V ;p