@Controller
public class DateEveryFiveSecController {
    private final SimpMessagingTemplate template;
    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");

    @Autowired
    public DateEveryFiveSecController(SimpMessagingTemplate template) {
        this.template = template;
    }
    
    @Scheduled(fixedRate = 5000)
    @MessageMapping("/time")
    @SendTo("/topic/date")
    public void increment() {
        String format = dateFormat.format(new Date());
        template.convertAndSend("/topic/date", format);
    }
}