Very minor clock issue - Framework 16

[Matt_Smith]

I’m having a very strange issue with the system clock on my Framework 16 that I got just before Christmas. It’s a dual boot Ubuntu/Windows 11 23h2 install. If I boot into Windows the system time in Windows is accurate. However, if I boot into Linux and THEN reboot into Windows 11 the clock in Windows will be way off until I reset it. Time in Linux is always ok. What’s up here?

[Jacob_Padgett]

This issue actually happens on any Ubuntu/Windows dual-boot system, and there’s several threads about it already, here’s a quick answer for you:

@jeshikat

Ubuntu prefers the RTC (Real Time Clock aka the BIOS time) set to UTC and then offsetting with time zones to display the correct local time. By default it even adjusts the RTC to UTC itself.

To disable, run the following terminal command:
sudo timedatectl set-local-rtc 1 --adjust-system-clock

Then reboot to BIOS:
sudo systemctl reboot --firmware-setup (or reboot and mash F2)

Then adjust the System Time and now Windows should stay at the local time.

[Charlie_6]

You can edit a registry file on Windows. Use a text editor to input the following, then rename the file format to .reg

RealTimeIsUniversal.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
“RealTimeIsUniversal”=dword:00000001

Then run it