def METHOD_NAME(self, source):
    """
    :return: latest date of news flash
    """
    latest_date = self.execute(
        "SELECT max(date) FROM news_flash WHERE source=:source",
        {"source": source},
    ).fetchone()[0] or datetime.datetime(1900, 1, 1, 0, 0, 0)
    res = timezones.from_db(latest_date)
    logging.info('Latest time fetched for source {} is {}'
                 .format(source, res))
    return res