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