def _format_time(when):
    if when is None:
        return None
    return datetime.isoformat(when)
Initialize a wxDocumentNotebook.
dataset/ETHPy150Open ClusterHQ/flocker/admin/cleanup.py/_format_time--crossover with--dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/wx/wx_notebook.py/wxDocumentNotebook.__init__