Qt QDate QTime顯示當前系統時間

   QDate date = QDate::currentDate();   //獲取當前日期

   QTime time = QTime::currentTime();   //獲取當前時間

效果如下：

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QLabel>

#include <QTimer>

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    MainWindow(QWidget *parent = 0);

    ~MainWindow();

private slots:

    void ClockTimeout();

private:

    QLabel      *mpSecond;          //當前秒數

    QLabel      *mpDate;            //日期 年月日

    QLabel      *mpHourMin;         //時分

    QTimer      *timer;

};

#endif // MAINWINDOW_H

#include "mainwindow.h"

#include <QDate>

#include <QTime>

#include <QString>

#include <QHBoxLayout>

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

{

    this->setFixedSize(300,50);

    QWidget *bgd = new QWidget; //設定背景

    bgd->setObjectName("bgd");

    this->setCentralWidget(bgd); 

    bgd->setStyleSheet("QWidget#bgd{background: qlineargradient(x1:0, y1:0, x2:1, y2:1,\

                       stop:0 white, stop: 0.4 gray, stop:1 green)}");

    QHBoxLayout *hLayout  = new QHBoxLayout;  //水平不拒

    hLayout->setContentsMargins(0,0,0,0);

    hLayout->setSpacing(0);

    mpDate = new QLabel;

    mpHourMin = new QLabel;

    mpSecond  = new QLabel;

    mpSecond->setAlignment(Qt::AlignBottom);

    mpDate->setAlignment(Qt::AlignBottom);

    mpHourMin->setAlignment(Qt::AlignBottom);

    //設定字型

    mpDate->setStyleSheet("font-size:20px;color:white;background-color:transparent");

    mpSecond->setStyleSheet("font-size:20px;color:white;background-color:transparent");

    mpHourMin->setStyleSheet("font-size:30px;color:white;background-color:transparent");

    hLayout->addStretch();\

    hLayout->addWidget(mpHourMin);

    hLayout->addSpacing(10);

    hLayout->addWidget(mpSecond);

    hLayout->addSpacing(10);

    hLayout->addWidget(mpDate);

    hLayout->addSpacing(10);

    bgd->setLayout(hLayout);

    timer = new QTimer(this);

    timer->start(1000);

    connect(timer,SIGNAL(timeout()),this,SLOT(ClockTimeout()));

}

void MainWindow::ClockTimeout()

{

   QDate date = QDate::currentDate();   //獲取當前日期

   QTime time = QTime::currentTime();   //獲取當前時間

   mpSecond->setText(":"+time.toString("ss"));

   mpHourMin->setText(time.toString("hh:mm"));

   mpDate->setText(date.toString("yyyy-MM-dd"));

}

MainWindow::~MainWindow()

{

}