VirtualBox is my virtualization software of choice. It is free and feature-rich, so all my virtual machines are created in VirtualBox. In this article, we will see how to set the BIOS date for a VirtualBox VM.

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In Windows, start a command line interpreter, go to C: Program Files Oracle folder and click VirtualBox to select, then holding left shift key, do a mouse right-button click and select 'Open command window here' menu, the interpreter has to be running now; Paste the following command (change the VM name to your name!). Oracle VM VirtualBox enables you to run 64-bit guest OSes even on a 32-bit host OS. To run a 64-bit guest OS on a 32-bit host system, ensure that you meet the following conditions: You need a 64-bit processor that has hardware virtualization support. See Section 10.3, “Hardware vs. Software Virtualization”.

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You might have a number of reasons to set a custom date for a VirtualBox VM. For example, when you want to try some outdated Windows build or some time-limited trial software. By default, VirtualBox uses the host machine's time and date and synchronizes it when you open your VM.
To set a custom date, you need to perform these steps:

1. Turn off your VM.
2. Open the command prompt. If you are using Windows, open it in the following folder:

   If you are using Linux, just open the terminal app.

3. Type the following command:

   Replace the 'My Virtual Machine' string with the actual name of the virtual machine you are using.

4. Now, you need to calculate the offset between the current date and the desired BIOS date for the VM, in milliseconds.
   For example, let's set it to 2003-06-06.
   In Windows, open the PowerShell console and type the following command:

   
   Note the TotalMilliseconds value from the output.

   Mac os 8 emulator. In Linux, the following script can be used:

   Save it as datetime.sh and execute:
   

5. Using the milliseconds value you calculated, execute the following command:

Now you can start your VM. Its BIOS date will be 2003-06-06 and will not be set from the host OS any more.

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Hi guys,
yes 'vbox4me2', your right. After posting the message I realized that. You do not have to remove completely the VBox guest additions (don´t know why). I have done the following to prevent my Windows XP from synchronisation of time:
go to:
Start->Settings->Control panel->managment->Services->Virtual Box Geust Additions (end this service and deactivate it)
Start->Settings->Control panel->managment->Services->Windows Time Service (end this service and deactivate it)
In taskbar go to date ssettings and deactivate time synchronisation with microsoft server
Now take a snapshot of the virtual machine and your done!
Becaus I have a german System here it´s in german:
Start->Einstellungen->Systemsteuerung->Verwaltung->Dienste->Virtual Box Geust Additions (Dienst beenden und deaktivieren)
Start->Settings->Control panel->managment->Services->Windows-Zeitgeber (Dienst beenden und deaktivieren)
In taskbar Doppelklick auf das Datum und unter 'Internetzeit' das Häckchen wegmachen für synchronisation mit Microsoft Zeitwerver.
Nun einen Sicherungspunkt erstellen und das wars!