For Series:

        >>> s = pd.Series(["1/1/2020 10:00:00+00:00", "2/1/2020 11:00:00+00:00"])
        >>> s = pd.to_datetime(s)
        >>> s
        0   2020-01-01 10:00:00+00:00
        1   2020-02-01 11:00:00+00:00
        dtype: datetime64[ns, UTC]
        >>> s.dt.tz
        datetime.timezone.utc

        For DatetimeIndex:

        >>> idx = pd.DatetimeIndex(["1/1/2020 10:00:00+00:00",
        ...                         "2/1/2020 11:00:00+00:00"])
        >>> idx.tz
        datetime.timezone.utc
        r=