@medo showEnd:false should do the trick,
i only used de dateformats to show the dates in a more readable format.

had the same issue, it shows you the end of the event, usually because its an all day event.
here is my config:
just added the option showEnd: false
and date and time formats according to moments.js

 module: "calendar",
                        header: "Calendar",
                        position: "top_center",
                        config: {
                                maximumEntries: 10,
                                maximumNumberOfDays: 32,
                                dateFormat: 'D MMMM - H:mm',
                                fullDayEventDateFormat: 'D MMMM',
                                timeFormat: 'absolute',
                                showEnd: false,
                                urgency: 0,
                                getRelative: 0,
                                calendars: [
etc...