docs: def expired(certificate):
      '''
      Returns a dict containing limited details of a
      certificate and whether the certificate has expired.
  
      .. versionadded:: 2016.11.0
  
      certificate:
          The certificate to be read. Can be a path to a certificate file,
          or a string containing the PEM formatted text of the certificate.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' x509.expired "/etc/pki/mycert.crt"
      '''
      ret = {}
  
      if os.path.isfile(certificate):
          try:
              ret['path'] = certificate
              cert = _get_certificate_obj(certificate)
  
              _now = datetime.datetime.utcnow()
              _expiration_date = cert.get_not_after().get_datetime()
  
              ret['cn'] = _parse_subject(cert.get_subject())['CN']
  
              if _expiration_date.strftime("%Y-%m-%d %H:%M:%S") <= \
                      _now.strftime("%Y-%m-%d %H:%M:%S"):
                  ret['expired'] = True
              else:
                  ret['expired'] = False
          except ValueError as err:
              log.debug('Failed to get data of expired certificate: %s', err)
              log.trace(err, exc_info=True)
  
      return ret