docs: private String getPacketHeader(final long timeStamp) {
        if (header) {
          StringBuffer buf = new StringBuffer(dateFormat.format(new Date(timeStamp)));
          //  RFC 3164 says leading space, not leading zero on days 1-9
          if (buf.charAt(4) == '0') {
            buf.setCharAt(4, ' ');
          }
          buf.append(getLocalHostname());
          buf.append(' ');
          return buf.toString();
        }
        return "";
    }