dtype: int64

        Pass None to convert to UTC and get a tz-naive index:

        >>> s = pd.Series([1],
        ...     index=pd.DatetimeIndex(['2018-09-15 01:30:00+02:00']))
        >>> s.tz_convert(None)
        2018-09-14 23:30:00    1
        dtype: int64
        c