def set(self, time):
        """Sets time in seconds since Epoch

        Args:
            time (:obj:`float`): time in seconds since Epoch (see time.time())

        Returns:
            None
        """
        self._time = time
        self._pb.sec = int(self._time)
        self._pb.nsec = int((self._time - self._pb.sec) * 10 ** 9)