code: func (r *RandomGenerator) DateTime() time.Time {
  	// Use a constant max value to make sure the same pseudo random
  	// values get generated for a given API.
  	max := time.Date(2016, time.July, 11, 23, 0, 0, 0, time.UTC).Unix()
  	unix := r.rand.Int63n(max)
  	return time.Unix(unix, 0).UTC()
  }
docs: // DateTime produces a random date.