#include <QFile>
#include <QFIleInfo>
#include <QDebug>
#include <QDateTime>

#include <windows.h>
#include <io.h>

int main()
{
    // Original timestamp, seconds since 1 Jan 1970 00:00 UTC
    // This corresponds to Oct 22 2014 06:17:25 UTC.
    qint64 timestamp = 1413958645;

    // This is Sep 15 2015, works fine.
    //timestamp = 1442301026;

    // Windows stores time as 100-nanosecond intervals since 1 Jan 1601 00:00 UTC
    unsigned long long wt = (timestamp + 11644473600LL) * 10000000LL;
    FILETIME ft = {DWORD(wt), DWORD(wt >> 32)};

    QString filePath("test-timestamp.txt");
    QFile file(filePath);
    if (file.open(QIODevice::Append))
    {
        HANDLE f = (HANDLE)_get_osfhandle(file.handle());
        if (!SetFileTime(f, NULL, &ft, &ft)) {
            qDebug() << "SetFileTime failed";
            return false;
        }
    } else {
        qDebug() << "Could not open " << filePath << " to set modification time";
        return false;
    }

    QFileInfo info(filePath);
    QDateTime lastModified = info.lastModified();
    QDateTime lastModifiedUTC = lastModified.toUTC();
    qDebug() << lastModified.timeSpec();
    qint64 secondsSinceEpoch = lastModifiedUTC.toMSecsSinceEpoch() / 1000L;
    if (secondsSinceEpoch != timestamp) {
        qDebug() << "Setting file time did not work: " << secondsSinceEpoch << " vs " << timestamp;
    }
}