The prefilled date should include time, as most Commons tools and forms already do, instead of stripping it: it's a valuable piece of information and quite tedious to copy from exif data (especially if you don't know the #metadata section; and most users don't), as well as quite difficult to remember.
Version: unspecified
Severity: minor
URL: http://commons.wikimedia.org/w/index.php?title=File:East_Side_Gallery,_Dmitri_Vrubel_%28in_2011%29.jpg&oldid=55624776