It’s maddening that despite the ISO having fixed the date format problem 33 years ago with ISO-8601, we still are plagued by people who can’t let go of outdated and confusing date formats.
There is no chance of confusing 2021-01-12 with 2021-12-01.
My only ask is that if work is done to permit customizing date formats, be sure to make ISO-8601 formatting an option.