virtual box - turn off time sync for virtual machine

1) shutdown the virtual machine
2) go to your virtual box folder, for example: C:\Program Files\Oracle\VirtualBox>
3) run command: VBoxManage setextradata <<virtual machine name>> "VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" 1
4) start the virtual machine

the commands above updates your "virtual-machine-name.vbox" file,
it adds one line to the "ExtraData" section!

<ExtraDataItem name="GUI/LastCloseAction" value="PowerOff"/>
<ExtraDataItem name="GUI/LastGuestSizeHint" value="1504,1099"/>
<ExtraDataItem name="GUI/LastNormalWindowPosition" value="-1558,31,1504,1141"/>
<ExtraDataItem name="VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" value="1"/>

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