I am making a fullCalendar backed car reservation functionality.
This is the coffescript file.

    updateEvent = (event, delta, revertFunc) ->

      $.ajax

        type: PUT

        dataType: json

        success: (data) ->

            alert Success

        error: (data) ->

            revertFunc()

            errors = data.responseJSON.reservations[0][1]

            for message of errors

                alert errors[message]

        url: event.updateUrl

        data:

          reservation:

            reservation_start: event.start.format('DD-MM-YYYY')

            reservation_end: event.end.format('DD-MM-YYYY')

            transport_id: event.transport_id

            user_id: event.user_id



$(document).ready ->

  $(.calendar).fullCalendar

    events: gon.path

    eventDrop: updateEvent

    eventResize: updateEvent

And this is JSON feed with the events.

[{start:2014-12-17T00:00:00.000Z,end:2014-12-21T00:00:00.000Z,title:Cassio Godinho,url:/reservas/44/edit,allDay:true,editable:true,updateUrl:/reservation/44,transport_id:1,user_id:1}]

The end date is 2014-12-21 but this is what I have on the calendar

The documentation says something about this (I think):

endParam

It is the moment immediately after the event has ended. For example, if the last full day of an event is Thursday, the exclusive end of the event will be 00:00:00 on Friday!

But im not quite sure what to do with this information...