Code:
function dateTest() {
                     var myNewDate = new Date();
                     Date.format(YYY-MM-DD);


                     window.plugins.datePicker.show({
                               date : myNewDate,
                     mode : 'date', // date or time or blank for both
                     allowOldDates : true
                    }, function(returnDate) {
                      var newDate = new Date(returnDate);
                      alert(newDate.toString());