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No, because if people were to short-hand reference December 21st, it'd be 12/21 vs them saying the 21st of December, 2012 as 21/12 although I suppose if we're counting European formatting then this could come up but then it raises the discussion of which formatting said person actually IS using vs. just being an idiot.
Not to mention, 2112 didn't have a slash or hyphen in it either
/semantics