I have a 64 bit Windows 7 with VirtualBox running the same 64 bit Windows 7 as a guest OS.
When I set a specific date and time, it will always revert to the host OS’s date and time on startup. How can I disable this?
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Backup the file called yourVMname.vbox
Open the file in a text editor and navigate to the
<ExtraData> element which should contain a list of
Add the following item to the list:
<ExtraDataItem name="VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" value="1"/>
The final section should look something like this:
The command to disable time synchronization between host and guest in Virtualbox is:
VBoxManage setextradata "VM name" "VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" 1
See the Virtualbox manual, section 9.14, especially 9.14.4.
Note that in a Windows host your command window's default directory must be in the directory where Vboxmanage.exe exists (default: C:\Program Files\Oracle\Virtualbox) or you have to type the full path to Vboxmanage.exe.