first commit

ClassicAssist/UI/Misc/ValueConverters/DateTimeToTimeSpanValueConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace ClassicAssist.UI.Misc.ValueConverters
+{
+    public class DateTimeToTimeSpanValueConverter : IValueConverter
+    {
+        public object Convert( object value, Type targetType, object parameter, CultureInfo culture )
+        {
+            return !( value is DateTime dt ) ? null : ( DateTime.Now - dt ).ToString();
+        }
+
+        public object ConvertBack( object value, Type targetType, object parameter, CultureInfo culture )
+        {
+            throw new NotImplementedException();
+        }
+    }
+}