Joind.in (http://joind.in) is an open source project and you can find the code at: http://github.com/joindin/joind.in. Looking for a good starting point? Try these easypick issues
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Dates should be j F Y or j M Y.
Also, for ranges, surely we can convert "May 13 2015 – May 14 2015" into to "13-14 May 2015"?