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It's definitely a UK thing. And 12 is a nicer round number than 10 - ask the Babylonians!

What's so nice about twelve-and-two (12)? Twelve (10) is a much nicer round number.

Though programmers may prefer base two (10) or base twelve-and-four (10).

If you say it in German, it doesn't even sound out of place. Zweiundzwölf, vierundzwölf.