def _to_datetime(iso8601_time):
    if iso8601_time is None:
        return None

    return iso8601_to_datetime(iso8601_time)
Convert a ISO8601-formatted datetime (from :py:mod:`boto`) to
dataset/ETHPy150Open Yelp/mrjob/mrjob/tools/emr/audit_usage.py/_to_datetime