• Does your machine/user have any TZ environment variable set?
• Does your Registry have HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation and is it same as other users?

• Added QCoreApplication instanciation
• Updated Qt version (same result with Qt 6.11.2 and 6.12.0 rc)

From what I see now:

• Systemtime is correct UTC
• LocalTime is my OS displayed time
• When getting a currentDateTime from a timezone build with Qt::localTime the timezones seem to be different but I'm getting the same time
• When getting a currentDateTime from a timeZone build with systemTimezone the timezones seem to be equal but I'm getting a different time

I'm going to open a ticket but since the issue is only happening on my machine I think there must be something weird somewhere else 🤔

Btw, I thought initially the lack of QCoreApplication might affect it, but I tried mine with and without and it made no difference (still correct). You might just put one in in case it affects your situation.

From https://codebrowser.dev/qt6/qtbase/src/corelib/time/qdatetime.cpp.html#_ZN9QDateTime15currentDateTimeERK9QTimeZone the definition of QDateTime QDateTime::currentDateTime(const QTimeZone &zone) introduced at Qt 6.5 reads:

QDateTime QDateTime::currentDateTime(const QTimeZone &zone)
{
    return fromMSecsSinceEpoch(currentMSecsSinceEpoch(), zone);
}

while the overload without parameter is:

QDateTime QDateTime::currentDateTime()
{
    return currentDateTime(QTimeZone::LocalTime);
}

Knowing this you might want to investigate a bit further why they are giving you different results in your environment and find where the underlying odd behaviour is coming from.

int main(int argc, char** argv)
{
    QCoreApplication app(argc, argv);
    qDebug() << QDateTime::currentDateTime().timeZone();
    qDebug() << QDateTime::currentDateTime().toString("dd/MM/yyyy hh:mm:ss");
    qDebug() << QTimeZone::systemTimeZone();
    qDebug() << QDateTime::currentDateTime(QTimeZone::systemTimeZone()).toString("dd/MM/yyyy hh:mm:ss");
    return 0;
}
QTimeZone("Europe/Berlin")
"25/09/2026 10:37:14"
QTimeZone("Europe/Berlin")
"25/09/2026 10:37:14"