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.
3 Replies
When switching OSes, the system clock appears to jump because of this mismatch.
This approach prevents Windows from changing the hardware clock based on local time.
Ensure your BIOS/UEFI clock is set to UTC if you're configuring Windows for UTC.
