zeogold: I considered that, but when was the last time you saw Mexico annex anything?
Now, Texas, on the other hand...

Elmofongo: I'm surprised we aren't called little Mexico ;)

Anyway the problem is persisting but the Manage to find the correct time zone, at least I got that fixed, but the issues where it goes back 1 hour and staying stuck at the same time after I shut down the PC is still here.

Maighstir: I'm not sure I am understanding you correctly. Are you saying that when you start the computer, it still says the same time as when you last shut it off?

If that's the case, the problem is likely that the CMOS battery on the motherboard is dead. I don't know how old your machine is, but that battery usually lasts about five years, if your machine is about that old or more, you should probably replace it (it's likely a CR2032 battery).

Cavalary: Did it start to happen recently? Because I remember seeing some reports of DST issues after the recent Windows updates. And the latest non-security batch (as in the "preview" for what will be incorporated in the single November batch) claims to solve some DST issues (but also shoves more telemetry down the throats of those installing it I gather).

If the difference is exactly one hour, must be a DST issue, can't be a battery problem. A battery problem would reset it to a default value probably.

Something that happened to me was having it run consistently slow, on my old computer. Usually 10 seconds per hour, so four minutes per day. Windows learned to update time daily instead of weekly, and kept using it like that, and used it for 7 years without it getting worse or other related symptoms. Also used it for another couple of weeks recently, after it spent close to a year and a half just sitting in a corner. And the time was perfectly right when I turned it back on, confirming what I had noticed before too, which was that the time loss happened only while running and in Windows. For those nearly 2 weeks I used Linux, and no time drift. (Also must say definitely didn't expect the BIOS battery to still hold at all, thought I'd find it having forgotten all BIOS stuff, so obviously including time, yet it didn't.)