this post was submitted on 19 Nov 2025
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I think I did, but nothing that a resync didn't fix.
YOu didn't (fully) fix it. This is something I don't see a lot of people talking about regarding Windows/Linux dual boot.
Unix-like systems like Linux set the computer's built-in real-time clock to UTC and then do any conversions to local time on the fly. I think that traces back to UNIX's origins as a minicomputer OS; it needed to talk to other minicomputers across time zones from the beginning.
Windows, like DOS before it, is designed to sit on a desk by itself plugged into nothing but power and accept data one, maybe two floppy disks at a time. Why would the user care about anything other than the local time? Hell the original IBM 5150 didn't even have a built-in RTC. It would forget what time it was when powered off and it would ask you when DOS booted.
Either OS can be set to do it either way in the modern era; pick one to change so that they don't fight. It's done with a registry edit in Windows or a bash command in Linux. Do one, or the other, but not both. I recommend changing Windows, because Windows will reset the RTC every daylight savings time and on a mobile system every time it crosses a time zone, Linux doesn't.