I have Arch Linux + Windows 8 on my laptop. In previous versions of Windows, there is a DWORD in the registry (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation\RealTimeIsUniversal) that switches between localtime and UTC, but this doesn't seem to be working in Windows 8 anymore.
I am now getting UTC time in Windows since it thinks BIOS gives it localtime which is actually UTC time, and after reboot into Arch Linux, the clock becomes localtime-0400, because Arch thinks BIOS is having the correct UTC time.
I do not want to let Arch Linux use localtime. Under this prerequisite, is there any possible solution?
Answer
RealTimeIsUniversal is really buggy and not an officially recommended solution (maybe that's why they disabled it in Win8?) See IBM PC Real Time Clock should run in UT and a response from Raymond Chen here: Why does Windows keep your BIOS clock on local time?. As of date I don't think there's a proper solution for this.
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