Earlier quoted context omitted.
Can we please also take a moment to wish tiny inconveniences upon designers of applications which ignore my locale and present me with "11:06 AM" or worse, "04/05/2020"?
The best are that have a settings page where they try to give an example. But use a day-of-month =< 12. Like your example. It couldn't have hurt to use and example of "22/05/2020"; then it is still infuriating, but clear.
Assuming you're addressing OP with this part, I think that was their point.
When an application presents you with "04/05/2020", you have no way of knowing whether it means crazy American dates or normal-people dates.