Forum Discussion
System Clock Warping After Dual-Boot
The system clock jumps forward or backward by exactly 4, 5, or 8 hours every time you boot back into Windows from Linux or macOS, due to one OS treating hardware clock as UTC while Windows treats it as local time — but the fix sometimes breaks time sync permanently.
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The full registry key is:
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation" /v RealTimeIsUniversal /t REG_DWORD /d 1
Hi, this is usually Windows and Linux/macOS disagreeing about whether the hardware clock is local time or UTC. Pick one standard. Many dual-boot users set Windows to UTC with RealTimeIsUniversal=1, then resync Windows time. The key is making both systems stop “correcting” the clock differently
