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Note: This method is only tested under Windows XP.

Panel

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation
"RealTimeIsUniversal"=dword:00000001

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After setting this, I could no longer update windows time from time.windows.com, but

Panel

time.mit.edu

worked.

This method makes the Windows to use UTC at boot time, but after the system run a couple of hours or resume from hibernate, the time goes wrong again.
I don't know how to solve this problem and I guess the following method can solve part of the problem.
Change the default synchronization interval from 7 days to 2 hours, to adjust your system time BEFORE it goes wrong.

Panel

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpClient
set SpecialPollInterval to 7100

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