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It's used in Sweden, at least.

Source: Me, having lived there most of my life.

Second source: https://en.wikipedia.org/wiki/Date_and_time_notation_in_Swed...

Thanks, I didn't know that.

It isn't used on any official forms and such that I'm aware of, at least outside technical circles, but people don't tend to have a problem with YMD ordered formats when they are used.

Sweden used YYYY-MM-DD before ISO 8601 was even written, and many other countries use it too.

I know at least some countries further East used it as a matter of course, but I wasn't aware any countries in/near Europe did.

YYYY-MM-DD+Z is pretty much the standard.