CODE EXAMPLE FOR JAVA

javafx live time and date

@FXML
public void initialize() {

    Timeline clock = new Timeline(new KeyFrame(Duration.ZERO, e ->  
         time.setText(LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")))
    ),
         new KeyFrame(Duration.seconds(1))
    );
    clock.setCycleCount(Animation.INDEFINITE);
    clock.play();
}