How to fix the Windows clock with BootCamp 5

I own a Macbook since i occasionally want to mess up with iOS stuff and i think it’s a great piace of hardware, but as a main OS i still use Windows.I have used Windows 7 and 8 with BootCamp 4, then i discovered that Apple eventually released BootCamp 5 and decided to do the update. After that i discovered that my clock was always wrong, 2 hours off the real time in my case. If you’re reading this, you probably have this same problem right?

So, why this happens and how to fix it?
I didn’t spend too much time on it, however it seems that Linux and OS X store the time as UTC in the hardware clock, while Windows stores it in local time (like UTC+1 and daylight offset). BootCamp sets a key in the Windows registry that should tell Windows to store it in UTC too, but apparently something doesn’t work correctly.

After some test i was able to fix it by letting Windows store the time as local time in the hardware, like it is designed to do. The registry key dosn’t seem to be documented so it’s probably not very reliable. This should mean i’ll get the wrong time on OS X but i don’t care since i never use it.

TL;DR
This will fix the clock in Windows and will probably get it wrong in OS X

  1. Launch regedit: [Win]+R, type “regedit” and press Enter
  2. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation
  3. Double click the “RealTimeIsUniversal” key and change the value from 1 to 0.
  4. Close regedit
  5. Reboot (i think it’s important to do a reboot, not power off and power on as in Windows 8 power off should work like an hibernation if i remember correctly)
  6. Set the clock to the right time
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