I wrote a little app that calculates the number of days between two dates.

https://github.com/judioo/Time-Between-Dates

It's very simple and not complete for example it does not handle landscape orientation BUT it took me ~5 minutes to write.

5 MINUTES!

OK that's a bit of a lie. I must have spent at least 10 minutes reading and testing alternative solutions using NSCalendar & NSDateComponents. It just didn't do exactly what I wanted so I computed the days myself. I feel there is a better solution but this one works!

It still tickles me how easy it is to write IOS apps.