Re: Y2K & Date Windowing - THIS IS NOT A BUG
It's in the same place in Windows 11 (and presumably therefore in 10, too). It's one of the few remaining things you need to launch the old Control Panel for, there isn't an equivalent in Settings.
Interestingly, in Windows 11 the default setting is 1950 -> 2049, so dates up to 31/12/49 should fall into the 21st Century correctly.
GJC