EXIF dates are formatted "YYYY:MM:DD HH:MM:SS" [1]. This is a very weird format which date parsers usually cannot deal with, so CommonsMetadata should parse it and return dates in a more standard format. (It should also handle weird things like " : : : : " or "0000:00:00 00:00:00" (see T28090).
[1] http://www.awaresystems.be/imaging/tiff/tifftags/privateifd/exif/datetimeoriginal.html
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