int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);
    ChronoTimer timer;
    qint64 interval = 24;
    timer.setInterval(days(interval));
    timer.start();
    qDebug() << "days:" << duration_cast<days>(timer.remainingTime()).count();

    QChronoTimer timer2;
    interval = 25;
    timer2.setInterval(days(interval));
    timer2.start();
    qDebug() << "days:" << duration_cast<days>(timer2.remainingTime()).count();
}