             return not guest.isSharedWithCozy and
                 (model.isNew() or
                     guest.status is not 'ACCEPTED' or
-                        model.startDateChanged())
+                        model.startDateChanged)
 
         if guestsToInform.length
             guestsList = guestsToInform.map((guest) -> guest.label).join ', '

    # Display confirmation modal for sending emails invitation to attendees
    confirmEmailInvitations: (model, callback) ->
        invitationsShouldBeSent = model.isNew() or
                                    model.startDateChanged() or
                                        model.attendeesChanged()
        if not invitationsShouldBeSent
            callback null, false
            return

            .add endOffset, 'd'
            .format tFormat
        @$('.input-end-time').timepicker('setTime', newValue)
