--- qcalendarwidget.cpp-5.7.0	2016-10-04 13:05:11.226844000 +0200
+++ qcalendarwidget.cpp	2016-10-04 12:47:21.000000000 +0200
@@ -298,7 +298,7 @@
         month = 1;
     else if (month > 12)
         month = 12;
-    QDate newDate(date.year(), m_month, 1);
+    QDate newDate(date.year(), month, 1);
     int day = date.day();
     if (day > newDate.daysInMonth())
         day = newDate.daysInMonth();