Problems with "ddd" format in QDateTime::fromString();

#include <QtCore/QCoreApplication>
#include <QDebug>
#include <QLocale>
#include <QDateTime>

void dumpAndReadDate(const QString& formatString) {
  QString dateString;
  QDateTime now = QDateTime::currentDateTime();
  QDateTime dateTime;

  //1st case, dump and re-read
  dateString = now.toString(formatString);

  qDebug() << "==============================================";
  qDebug() << "Current datetime dumped w/ format:" << formatString << " is " << dateString;
  dateTime = QDateTime::fromString(dateString, formatString);
  qDebug() << "Reading back with format " << formatString << ":";
  qDebug() << dateTime << ", isValid:" << dateTime.isValid();
  qDebug() << "==============================================";
}

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

    qDebug() << "Country:" << loc.countryToString(loc.country());

    dumpAndReadDate("ddd");
    dumpAndReadDate("ddd MM");
    dumpAndReadDate("ddd MM yy");
    dumpAndReadDate("ddd MM d"); //false
    dumpAndReadDate("ddd MM dd"); //false
    dumpAndReadDate("ddd MM dddd"); //true

    return a.exec();
}