A lot of people use. I think it is common at least in Europe but probably varies by country.

I found the list on Wikipedia: https://en.wikipedia.org/wiki/List_of_date_formats_by_countr....

So some of Eastern Europe and Scandinavia.

d.m.y is used in several country across Europe (most certainly in Germany, Austria, Switzerland)

People that use / to separate hours and minutes.

I wrote that comment on 14.03.2024 at 14:55:00

I think you mean 0/55/2