Yup, still the same issue.
191145

Manually setting the time zone solves the issue of the wrong time, but it's only one of the symptoms of the underlying problem that Windows thinks I'm in Europe. Asking Cortana for the Weather or...

My bios time settings are correct and my computer is fairly new so I doubt the CMOS battery is dead or anything.

Yup, I've checked my region settings and they're set to the US.

So I first noticed this problem when my automatic time zone for some reason jumped ahead to Central European Time when I'm actually in US Eastern Time. Opening up the Maps and Weather apps pinpoints...