def unix_time_from_uuid1(uuid_arg):
    """
    Converts a version 1 :class:`uuid.UUID` to a timestamp with the same precision
    as :meth:`time.time()` returns.  This is useful for examining the
    results of queries returning a v1 :class:`~uuid.UUID`.

    :param uuid_arg: a version 1 :class:`~uuid.UUID`
    """
    return (uuid_arg.time - 122192928000000000) / 10000000.0
