Nobody says YYYYMMDD; but it makes total sense, since I spend my life at a keyboard sorting structured data, and I can tell you it makes life a fuckload easier
In written & spoken parlance, regardless of your views, the only correct way to move is smallest to largest; thus, DDMMYYYY; otherwise you may as well go back to Roman numerals.
The rest.. that's just words. You can say what you like, Sir, it doesn't make you any less wrong.
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