def METHOD_NAME(self):
    """
    Returns
    -------
    pd.DataFrame
    Notes
    -----
    Objects are converted using `pandas.to_numeric()`.
    The reason for doing this is to strip out the timezone
    information from data columns.  We have to do this otherwise
    Pandas complains if we try to put a column with multiple
    timezones (e.g. Europe/London across a daylight saving
    boundary).
    """
    return self._data.apply(pd.to_numeric, errors='ignore')