Tätigkeiten überarbeitet.

KanSan/IstFertigZuTextConverter.cs

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+using Syncfusion.Windows.Shared;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text;
+using System.Windows.Data;
+
+namespace KanSan
+{
+    class IstFertigZuTextConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            DateTime dateTime = (DateTime)value;
+            if (dateTime != null && dateTime != DateTime.MinValue)
+                return string.Format("(Erledigt am {0})",dateTime.ToShortDateString());
+            return "";
+            
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}