Your example indeed works. But I discovered that the control calls the __doPostBack() function when you select a different date.
Our prorgam uses an Webservice to get the appoinments so we disabled the __doPostBack() event, is there a different way of getting the selected date out of the DatePicker? This used to work but after updating to 2016.3.1027.45 it stopped working.
Is there a way to fix this?