def addSelectedDateListener(self, listener, dobj=False):
        if dobj:
            self.selectedDObjListeners.append(listener)
        else:
            self.selectedDateListeners.append(listener)
- dobj - listener accept datetime.date object rather than y,m,d triple
dataset/ETHPy150Open pyjs/pyjs/pyjswidgets/pyjamas/ui/Calendar.py/DateSelectedHandler.addSelectedDateListener