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

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