Feiertagsberechnung

VERAG_PROG_ALLGEMEIN/Classes/cFeiertage.vb

@@ -1,4 +1,6 @@
-Public Class cFeiertage
+Imports System.Runtime.InteropServices.ComTypes
+
+Public Class cFeiertage
     Private _Year As Integer
     Private _Ostern As Date
 
@@ -65,15 +67,23 @@
 
     Public Function GetLastyDayInyMonth(ByVal day As DayOfWeek, ByVal month As Integer, ByVal year As Integer) As DateTime
 
-        ' Create a start date for the 1st day of the month   
-        Dim startDate As DateTime = New DateTime(year, month, 1)
+        ' Create a start date for the last weekday of the month
+        Dim startDate As DateTime
 
-        While startDate.DayOfWeek <> day
-            startDate = startDate.AddDays(1)
+        If (month < 12) Then
+            startDate = New DateTime(year, month + 1, 1)
+        Else
+            startDate = New DateTime(year + 1, 1, 1)
+            startDate = startDate.AddDays(-1)
+        End If
+
+        While (startDate.DayOfWeek <> day)
+            startDate = startDate.AddDays(-1)
         End While
 
         Return startDate
 
+
     End Function