Adding the UI to the same repo. Made some default theme progress

MediaBrowser.UI/Converters/DateTimeToStringConverter.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace MediaBrowser.UI.Converters
+{
+    public class DateTimeToStringConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var date = (DateTime)value;
+
+            string format = parameter as string;
+
+            if (string.IsNullOrEmpty(format))
+            {
+                return date.ToString();
+            }
+            
+            if (format.Equals("shorttime", StringComparison.OrdinalIgnoreCase))
+            {
+                return date.ToShortTimeString();
+            }
+
+            return date.ToString(format);
+        }
+
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}