Returns the current date time for this widget.
        
        :return     <datetime.datetime>

def currentDateTime(self):
        """
        Returns the current date time for this widget.
        
        :return     <datetime.datetime>
        """
        view = self.uiGanttVIEW
        scene = view.scene()
        point = view.mapToScene(0, 0)
        return scene.datetimeAt(point.x())