ownCloud 8.2 will be last version to ship this codebase. It will be replaced by the rework. If you want to implement new features, please strongly consider implementing them in the calendar-rework
Just clone this repo into your apps directory. Get the lastest version of master:
git clone git://github.com/owncloud/calendar.git
cd calendar
Get the lastest version of rework:
git clone git://github.com/owncloud/calendar.git
cd calendar
git checkout rework