Qt5 implementation of the main window status bar display time

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <>
#include <QLabel>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
  Q_OBJECT
public:
  explicit MainWindow(QWidget *parent = 0);
  ~MainWindow();
private slots:
  void on_actionNew_Window_triggered();
  void time_update(); // Time update slot function, status bar display time
private:
  Ui::MainWindow *ui;
  QLabel *currentTimeLabel; // Create a QLabel object first
  MyDialog *mydialog;
};
#endif // MAINWINDOW_H

#include ""
#include "ui_mainwindow.h"
#include ""
#include <QLabel>
#include <QDateTime>
#include <QTimer>
#include <QString>
MainWindow::MainWindow(QWidget *parent) :
  QMainWindow(parent),
  ui(new Ui::MainWindow)
{
  ui->setupUi(this);
  currentTimeLabel = new QLabel; // Create the QLabel control
  ui->statusBar->addWidget(currentTimeLabel); // Add this control to the status bar
  QTimer *timer = new QTimer(this);
  timer->start(1000); //Send the timeout signal every 1000ms.
  connect(timer, SIGNAL(timeout()),this,SLOT(time_update()));
}
MainWindow::~MainWindow()
{
  delete ui;
}
void MainWindow::on_actionNew_Window_triggered()
{
  mydialog = new MyDialog;
  mydialog->show();
}
void MainWindow::time_update()
{
  //[1] Getting the time
  QDateTime current_time = QDateTime::currentDateTime();
  QString timestr = current_time.toString( "yyyysurname NianMMmoondddate hh:mm:ss"); //Set the format of the display
  currentTimeLabel->setText(timestr); //Set the text content of the label to the time.
}

#include <QTimer>

//Date/Time Display
QTimer *timer = new QTimer(this);
connect(timer,SIGNAL(timeout()),this,SLOT(timerUpdate()));
timer->start(1000);

void userwindow::timerUpdate()
{
  QDateTime time = QDateTime::currentDateTime();
  QString str = ("yyyy-MM-dd hh:mm:ss dddd");
  ui->dateTime->setText(str);
}