That sounds awfully like your list is a list of strings that represent dates and not QDates at all. QDate sorts correctly.
Qt Code: 
  1. #include <QtCore>
  2.  
  3. int main(int argc, char **argv) {
  4.     QCoreApplication app(argc, argv);
  5.  
  6.     QList<QDate> dates;
  7.     dates << QDate(2014, 5, 2)  // Friday
  8.         << QDate(2014, 4, 28)   // Monday
  9.         << QDate(2014, 4, 26);  // Saturday
  10.  
  11.     qDebug() << "Before" << dates;
  12.     qSort(dates.begin(), dates.end());
  13.     qDebug() << "After " << dates;
  14.  
  15.     return 0;
  16. }
  17.  
  18. // Before (QDate("Fri May 2 2014") ,  QDate("Mon Apr 28 2014") ,  QDate("Sat Apr 26 2014") )
  19. // After  (QDate("Sat Apr 26 2014") ,  QDate("Mon Apr 28 2014") ,  QDate("Fri May 2 2014") )
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