A minor quibble with "The sprintf() being the last expression eliminates the need for an explicit return.
I always put an explicit return except for sort subs. Here the code is going to return the return value of sprintf(), presumably "1" which really doesn't mean anything in the context of this code. Ending with return; statement would return undef. I guess this is a style thing, YMMV.
BTW, I always go with a YYYY-MM-DD format. For (a) consistency and (b) this produces a natural ASCI sort order that does "what you expect".
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