diff --git a/components/tvplanit/source/vpweekview.pas b/components/tvplanit/source/vpweekview.pas
index abb52c688..5deb38ef5 100644
--- a/components/tvplanit/source/vpweekview.pas
+++ b/components/tvplanit/source/vpweekview.pas
@@ -486,7 +486,7 @@ end;
 
 function TVpWvDayHeadAttr.IsStoredDateFormat: Boolean;
 begin
-  Result := FDateFormat = 'ddddd';
+  Result := FDateFormat <> 'ddddd';
 end;
 
 procedure TVpWvDayHeadAttr.SetAlignment(Value: TAlignment);