QT26 show time and date

1. mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>


namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void showTime();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

2. mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QTimer>
#include <QDateTime>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QTimer *timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(showTime()));
    timer->start();

    QDateTime datetime = QDateTime::currentDateTime();
    QString datetimetext = datetime.toString();
    ui->date_label->setText(datetimetext);

}


void MainWindow::showTime()
{
    QTime time = QTime::currentTime();
    QString time_text = time.toString("hh : mm : ss");
    ui->time_label->setText(time_text);
}


MainWindow::~MainWindow()
{
    delete ui;
}