Please have a look at http://fullcalendar.io/scheduler/
I have created a Proof of Concept with it, including drag and drop. though it is not finished.
Please contact me, if you want me to (continue) build this widget for you.
andries @ flockofbirds . org
Hi Patrick, I am not 100% sure what you are looking for, but you can take a look at the calender widget from the appstore. It does not allow drag and drop, but you can use it for to display the time and dates.