def SetDefaultDateRange(self, start_date=None, end_date=None):
        if start_date is not None:
            self._last_selected_start_date = start_date
        if end_date is not None:
            self._last_selected_end_date = end_date
see also `childAtIndex`
dataset/ETHPy150Open manahl/mdf/mdf/viewer/frame.py/MDFViewerFrame.SetDefaultDateRange--crossover with--dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.3/pymel/core/nodetypes.py/DagNode.getChildren