Changing the BIOS date in virtual PC can be done very easily by entering the emulated BIOS. However, to make it keep that date after a reboot, you need to edit your vmc file.
1. Locate your .vmc file, and open it in notepad. Make sure Virtual PC is closed so you can save your edited file.
2. As you can see, its a standard XML file. All you need to do is insert
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<components>
<host_time_sync>
<enabled>false</enabled>
</host_time_sync>
</components>
3. You can now change your time and date in the emulated bios, and now the clock should not revert to the host time after a reboot.
In VMWare
Open your .vmx configuration file. All you need to do is place the following lines of code anywhere in this text file.
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tools.syncTime = "FALSE"
time.synchronize.continue = "FALSE"
time.synchronize.restore = "FALSE"
time.synchronize.resume.disk = "FALSE"
time.synchronize.shrink = "FALSE"