I had clock issues after installing Windows XP in Bootcamp. Every time I would start up Windows, the system clock would be four hours behind the actual time. I would change the time manually and everything would seem OK. After that I would re-boot in OSX and guess what? The clock in OSX was now four hours behind! I would click the clock and it would reset itself to the current time.
The resolution to this was quite simple!
First step: Adjust the time in both Windows and OSX to be time.apple.com & click daylight savings time.
Second step: Log into Windows and run "regedit".
Third step: in regedit, go to the following tree: HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Control > TimeZoneInformation
Fourth step: right-click "TimeZoneInformation" and add the following DWORD key: RealTimeIsUniversal
Fifth step: set the DWORD key "TimeZoneInformation" DValue to "1".
Sixth step: Save & Exit regedit.
All done!
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