1、引用头文件

#include <QDateTime>
 #include <QTime>

2、显示当前时间

ui->label->setText("QDateTime:\nCurrent Time is:" +
                        QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss ddd"));

     ui->label->setText(ui->label->text() + "\n\nQTime:\nHour minute second msec is:" +
                        "\n  Hour: " + QString::number(QTime::currentTime().hour()) +
                        "\n  Minute: " + QString::number(QTime::currentTime().minute()) +
                        "\n  Second: " + QString::number(QTime::currentTime().second()) +
                        "\n  Msec: " + QString::number(QTime::currentTime().msec()));

3、效果

        

QDateTime、QTime获取当前时间_头文件