QChronoTimer doesn't work as expected

IlyaLts

Hello.

Qt 6.8 introduced QChronoTimer, which provides nanosecond resolution and a ±292 years range.

However, when I test it, QChronoTimer gives me the same range as QTimer, which is 25 days, regardless of my approach.
Am I doing something wrong, or is QChronoTimer broken?

Code:

#include <QApplication>
#include <QMainWindow>
#include <QchronoTimer>
#include <chrono>

using namespace std::chrono;

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QChronoTimer timer;
    qint64 interval = 24;
    timer.setInterval(days(interval));
    timer.start();
    qDebug("Test 1 - %lld days", duration_cast<days>(timer.remainingTime()).count());

    QChronoTimer timer2;
    interval = 25;
    timer2.setInterval(days(interval));
    timer2.start();
    qDebug("Test 2 - %lld days", duration_cast<days>(timer2.remainingTime()).count());

    QChronoTimer timer3;
    interval = 26;
    timer3.setInterval(days(interval));
    timer3.start();
    qDebug("Test 3 - %lld days", duration_cast<days>(timer3.remainingTime()).count());

    return 0;


    QMainWindow window;
    window.show();
    return app.exec();
}

Output:

Test 1 - 23 days
Test 2 - -24 days
Test 3 - -23 days

ChrisW67

After correcting the QChronoTimer include and selecting C++20, this code works just fine for me on Linux, GCC 13.3, Qt 6.8.1.
(Compiler does throw warnings about the conversion to match the %lld format specifier.)

What platform and tool chain are you using?

Christian Ehrlicher

Looking at the code I wonder why it should work for you @ChrisW67

Created a bug report at https://bugreports.qt.io/browse/QTBUG-132388

/edit: Looks like it's a windows only issue which will be fixed in the near future.

ChrisW67

@Christian-Ehrlicher said in QChronoTimer doesn't work as expected:

/edit: Looks like it's a windows only issue which will be fixed in the near future.

Good, so I am not going mad then :)