Rewind - Calendar View
There are tons of calendar components for iOS but we decided to implement our own (including dragging and adjusting of time intervals etc.) which was a lot of fun.
Btw. Rewind is a time tracking app for iPhone which automatically tracks your time based on your location. It's free to try.
https://itunes.apple.com/us/app/rewind-automatic-time-tracking/id967979724?l=de&ls=1&mt=8