Inserting a QDate into an Oracle DB with a prepared statements fails for timezones like CET

create table cdtest (mydatum date); 

int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);
   
    auto db = QSqlDatabase::addDatabase(QStringLiteral("QOCI"), QStringLiteral("DateTest"));

    db.setDatabaseName(QStringLiteral("..."));
    db.setUserName(QStringLiteral("user"));
    db.setPassword(QStringLiteral("pwd"));

    QDate datum(2033,1,1);
    QDateTime dt(datum);

    qDebug() << "timeZone=" << dt.timeZone().displayName(dt, QTimeZone::OffsetName);

    QSqlQuery q(db);
    q.prepare(QStringLiteral("insert into CDTEST MYDATUM) values (:mydatum)"));
    q.bindValue(QStringLiteral(":mydatum"), datum);
    qDebug() << "exec: " << q.exec();

    return 0;
}

// Zone in +hh:mm format (stripping UTC prefix from OffsetName)
QString timeZone = dt.timeZone().displayName(dt,  QTimeZone::OffsetName).mid(3);