http://lifehacker.com/5742148/fix-windo ... -with-os-x
regedit.exe
navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation.
Right click anywhere in the right pane and hit New > DWORD (32-bit) Value. Name it RealTimeIsUniversal, then double click on it and give it a value of 1.
Lastly, reboot into OS X, then reboot back into Windows. You should now notice that your clock actually displays the correct time.
fix windows clock issues when dual booting with osx
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