Endfield is not updated after drag and drop of event in calendar

Steps to reproduce:

1. Have an application that uses fullcalendar macro with the endfield
2. Add an event and go to calendar
3. Drag and drop the event to different days and hours
4. Observe the page of the event

Expected result: the dates are corresponding to the ones from the calendar

Actual result: just startfield is updated and endfield remained the same.