QDate format does not accept a combination of date representations

The QDate format does not accept a combination of date representations.
To write QDateEdit::setDisplayFormat("dddd dd/MM/yy") to display "Tuesday 03/01/07" will return invalid dates when changing the date at the end of a month.

Can be reproduced with the following example:

Set the date to 31/12/07. Select the number "12" and then change this number to "11". This will return the invalid date: 30 30/13007.

#include <QtGui>

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

QApplication app(argc, argv);
QWidget widget;
QDateEdit *date = new QDateEdit(QDate::currentDate(), &widget);
date->setDisplayFormat("dddd dd/MM/yy");

QHBoxLayout *hbox = new QHBoxLayout;
hbox->addWidget(date);
widget.setLayout(hbox);
widget.show();

return app.exec();
}