this post was submitted on 22 Aug 2023
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Windows and Linux keeps track of time differently. One stores the time in your current time zone. The other stores the GMT time and adds an offset. I forget which one does what but it results in your time being wrong each time you switch from Linux to Windows or vice versa. You can search for how to fix it, its not very hard, or you can just ignore it and reset your clock each time you switch OS.
I don't think that's the case anymore.
I just checked, the time in the UEFI BIOS is in UTC, yet both Linux and Windows 10 display the local time correctly as an offset to UTC. I didn't have to do anything special for that.
Edit:
So I looked a bit deeper into it, and this is apparently controlled by a registry key called
RealTimeIsUniversalin[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]. You can paste the text below in a .reg file and then import it to set the parameter:I confirmed that this setting exists on my system, but I have no memory of ever manually setting this parameter. It's documented in the Arch wiki though, so it's possible that I did set it and forgot about it.
In any case, if you do a fresh Windows install and your time differs between Linux and Windows , this is what you should check.
It is with Windows 10 and Mint. I booted into Mint a few days ago, and when I switched back to Windows, the time was wrong.
Apparently it's easy to fix, but I keep forgetting while I'm in Mint >.<
@Tippon @SpaceCadet you can set your system clock to UTC to fix the problem. Here’s a registry fix to tell Windows to use UTC.
https://uilton.com/kb/how-to-make-windows-store-time-in-utc/
Brilliant, thank you :)