code: func TimestamptzOut(db XODB, v0 time.Time) (pgtypes.Cstring, error) {
  	var err error
  
  	// sql query
  	const sqlstr = `SELECT pg_catalog.timestamptz_out($1)`
  
  	// run query
  	var ret pgtypes.Cstring
  	XOLog(sqlstr, v0)
  	err = db.QueryRow(sqlstr, v0).Scan(&ret)
  	if err != nil {
  		return pgtypes.Cstring{}, err
  	}
  
  	return ret, nil
  }
docs: // TimestamptzOut calls the stored procedure 'pg_catalog.timestamptz_out(timestamp with time zone) cstring' on db.