QDateTime in utc converted to string from QVariant are not restored correctly

#include <QtCore>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    const QDateTime dt1 = QDateTime::currentDateTimeUtc();
    const QDateTime dt2 = QVariant( dt1.toUTC() ).toDateTime();
    const QString dts = QVariant( dt1 ).toString();
    const QDateTime dt3 = QVariant( dts ).toDateTime();

    qWarning()
        << ( dt1 == dt2 ) // true
        << ( dt1 == dt2 ) // true
        << ( dt1 == dt3 ) // false
        << dts
    ;

    //return a.exec();
    return 0;
}