"setextradata ... GetHostTimeDisabled" doesn't work correct

[Lauscher]

I am testing

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vboxmanage setextradata "XP" "VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" value="1"

I found this:
- Setting a new system time in the guest: ok, it stays.
- Rebooting the guest: ok, same time as before (+ some minutes)
- Running a snapshot: ok, same time as before
- Shutdown VM und boot again: fails, guest time is set to host time

Is there any solution to this problem? I found the question sometimes in the forum, but no working answer. I think, VirtualBox should remember the last guest system time (like it does in a snapshot), but it doesn't.
(Windows internet time synchronization is disabled, network connection is cutted)

[Perryg]

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vboxmanage setextradata <vmname> “VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled” “1″

Will disable the time sync of the guest. After you run this you should see it in the extradata section of the guests control file.

[Lauscher]

Yes, sorry, I mean (without "value="):

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vboxmanage setextradata "XP" "VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" "1"

In the .vbox file I find

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 <ExtraDataItem name="VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" value="1"/>

and except the situation

- Shutdown VM und boot again: fails, guest time is set to host time

it works right.

[Lauscher]

except the situation

- Shutdown VM und boot again: fails, guest time is set to host time

it works right.

Is there no solution to this issue?

[Perryg]

Not that I know of. Not unless you can stop the bios time update at boot in the guest.