Obtenga de Time Secs y NSECS
t = rospy.Time.from_sec(time.time())
seconds = t.to_sec() #floating point
nanoseconds = t.to_nsec()
d = rospy.Duration.from_sec(60.1) # One minute and one tenth of a second
seconds = d.to_sec() #floating point
nanoseconds = d.to_nsec()
Merwanski