Index: AXimpl/Admin/STAT/Invoice/Processor.cls.xml
===================================================================
diff -u -r53686 -r53708
--- AXimpl/Admin/STAT/Invoice/Processor.cls.xml	(.../Processor.cls.xml)	(revision 53686)
+++ AXimpl/Admin/STAT/Invoice/Processor.cls.xml	(.../Processor.cls.xml)	(revision 53708)
@@ -295,8 +295,9 @@
 <Private>1</Private>
 <ReturnType>%String</ReturnType>
 <Implementation><![CDATA[
-	#dim StatistiekDatum As %String = $Replace($$EXTDATE^vhLib.DataTypes(StatistiekMaand,"DS"),"\","-")
-	Quit $Replace(StatistiekDatum,$Piece(StatistiekDatum,"-",3),"01")
+	#dim Dag1VanStatistiekMaand As %Date = $$CALCDATE^vhLib.DataTypes(StatistiekMaand,"M","FD")
+	#dim StatistiekDatum As %String = $Replace($$EXTDATE^vhLib.DataTypes(Dag1VanStatistiekMaand,"DS"),"\","-")
+	Quit StatistiekDatum
 ]]></Implementation>
 </Method>