qt实现倒计时示例

#include <QApplication>
#include <QLabel>
#include <QDate>
#include <QLayout>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QLabel *label = new QLabel;
    QDate currentDate = QDate::currentDate();
    QDate kaoyanri(2015,1,7);
    qint64 tianshui = currentDate.daysTo(kaoyanri);
    QString tianshu = QString::number(tianshui);
    QString string("离考研还有<font color='red';>");
    QString tian("</font>天");
    string = string + tianshu + tian;

    label->setText(string);
    label->setWindowTitle("考研倒计时");
    QFont font;
    font.setPointSize(30);
    label->setFont(font);
    label->resize(300,43);
    label->show();
    return a.exec();
}