}

	today := time.Now()
	return SecretMeta{
		SerialNumber: fmt.Sprintf("%x", cert.SerialNumber),
		NotAfter:     cert.NotAfter.Format(time.RFC3339),
		NotBefore:    cert.NotBefore.Format(time.RFC3339),
		Type:         certType,
		Valid:        today.After(cert.NotBefore) && today.Before(cert.NotAfter),
		TrustDomain:  trustDomain,
	}, nil
}

func parseTrustBundles(secret *auth.Secret, state string) ([]SecretItem, error) {

			fmt.Fprintf(tw, "%s\t%s\t%s\t%t\t%s\t%s\t%s\t%s\n",
				s.Name, s.Type, s.State, s.Valid, s.SerialNumber, s.NotAfter, s.NotBefore, s.SecretMeta.TrustDomain)
		} else {
			fmt.Fprintf(tw, "%s\t%s\t%s\t%t\t%s\t%s\t%s\n",
				s.Name, s.Type, s.State, s.Valid, s.SerialNumber, s.NotAfter, s.NotBefore)
		}
	}
	return tw.Flush()
}

- Kubeadm: generate CA certificates with a start time that is offset 5 minutes in the past relative to the current system time to workaround cases of clock desync.
  client-go: allow to set NotBefore in NewSelfSignedCACert() ([#118922](https://github.com/kubernetes/kubernetes/pull/118922), [@champtar](https://github.com/champtar)) [SIG API Machinery, Auth and Cluster Lifecycle]