diff --git a/docs/changes.txt b/docs/changes.txt
index 1dfe757d47..6f07c51e25 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -205,6 +205,7 @@ All:
   (based on patch by Stefan Kowski)
 - added wxMicroSleep() and wxMilliSleep() replacing deprecated wxUsleep()
 - basic UDP sockets support (Lenny Maiorani)
+- fixed wxDateTime::GetWeekDayName() for some dates (Daniel Kaps)
 
 All (GUI):
 
diff --git a/src/common/datetime.cpp b/src/common/datetime.cpp
index 2b208928df..3ac780395f 100644
--- a/src/common/datetime.cpp
+++ b/src/common/datetime.cpp
@@ -817,10 +817,12 @@ wxString wxDateTime::GetWeekDayName(wxDateTime::WeekDay wday,
 {
     wxCHECK_MSG( wday != Inv_WeekDay, _T(""), _T("invalid weekday") );
 
-    // take some arbitrary Sunday
+    // take some arbitrary Sunday (but notice that the day should be such that
+    // after adding wday to it below we still have a valid date, e.g. don't
+    // take 28 here!)
     tm tm;
     InitTm(tm);
-    tm.tm_mday = 28;
+    tm.tm_mday = 21;
     tm.tm_mon = Nov;
     tm.tm_year = 99;