Change the Pre-Date of the end-date after selected the start-date #108

When I create a new date I select a start-date (e.g. 2017-1-1) and then I want to select a end-date, the datepicker starts at TODAY and not at the selected start-date. Though I have to change the datepicker til 2017-1-1.

Is it possible to change the eventend_displayDefaultDate to the start-date?