Applied fix by monjudoh in _setDateDatepicker

Author: trentrichardson

jquery-ui-timepicker-addon.js

@@ -724,7 +724,7 @@ $.datepicker._setTimeDatepicker = function(target, date, withDate) {
 $.datepicker._base_setDateDatepicker = $.datepicker._setDateDatepicker;
 $.datepicker._setDateDatepicker = function(target, date) {
 	var inst = this._getInst(target),
-		tp_date = new Date(date.getTime());
+		tp_date = !!date ? new Date(date.getTime()) : date;
 
 	this._updateDatepicker(inst);	
 	this._base_setDateDatepicker.apply(this, arguments);