qDebug() << QDateTime::currentDateTime().toString(Qt::ISODate);
qDebug() << QDateTime::currentDateTime().toTimeSpec(Qt::OffsetFromUTC).toString(Qt::ISODate);
QDateTime now = QDateTime::currentDateTime();
int offset = now.offsetFromUtc();
now.setOffsetFromUtc(offset);
qDebug() << now.toString(Qt::ISODate);
"2021-03-04T21:30:22"
"2021-03-04T21:30:22Z"
"2021-03-04T21:30:22+03:00"