code: func (p *Pod) CreationTime() (time.Time, error) {
  	if !(p.isPrepared || p.isRunning() || p.IsAfterRun()) {
  		return time.Time{}, nil
  	}
  	t, err := p.getModTime("pod-created")
  	if err == nil {
  		return t, nil
  	}
  	if !os.IsNotExist(err) {
  		return t, err
  	}
  	// backwards compatibility with rkt before v1.20
  	return p.getModTime("pod")
  }
docs: // CreationTime returns the time when the pod was created.
  // This happens at prepare time.