diff --git a/osu.Game/Beatmaps/Objects/Catch/CatchConverter.cs b/osu.Game/Beatmaps/Objects/Catch/CatchConverter.cs
index dbd97e90bc..317a4e9bb1 100644
--- a/osu.Game/Beatmaps/Objects/Catch/CatchConverter.cs
+++ b/osu.Game/Beatmaps/Objects/Catch/CatchConverter.cs
@@ -25,7 +25,7 @@ namespace osu.Game.Beatmaps.Objects.Catch
                 {
                     OsuBaseHit o = i as OsuBaseHit;
 
-                    if (o == null) throw new Exception(@"Can't convert!");
+                    if (o == null) throw new HitObjectConvertException(@"Catch", i);
 
                     h = new Fruit
                     {
diff --git a/osu.Game/Beatmaps/Objects/HitObjectConverter.cs b/osu.Game/Beatmaps/Objects/HitObjectConverter.cs
index a70526e85a..723199d8f1 100644
--- a/osu.Game/Beatmaps/Objects/HitObjectConverter.cs
+++ b/osu.Game/Beatmaps/Objects/HitObjectConverter.cs
@@ -1,6 +1,7 @@
 //Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
+using System;
 using System.Collections.Generic;
 
 namespace osu.Game.Beatmaps.Objects
@@ -10,4 +11,13 @@ namespace osu.Game.Beatmaps.Objects
     {
         public abstract List<T> Convert(List<HitObject> input);
     }
+    public class HitObjectConvertException : Exception
+    {
+        public HitObject Input { get; }
+        public HitObjectConvertException(string modeName, HitObject input)
+            : base($@"Can't convert from {input.GetType().Name} to {modeName} HitObject!")
+        {
+            Input = input;
+        }
+    }
 }
diff --git a/osu.Game/Beatmaps/Objects/Mania/ManiaConverter.cs b/osu.Game/Beatmaps/Objects/Mania/ManiaConverter.cs
index 22d8f9ae9c..cc03244709 100644
--- a/osu.Game/Beatmaps/Objects/Mania/ManiaConverter.cs
+++ b/osu.Game/Beatmaps/Objects/Mania/ManiaConverter.cs
@@ -28,7 +28,7 @@ namespace osu.Game.Beatmaps.Objects.Mania
                 {
                     OsuBaseHit o = i as OsuBaseHit;
 
-                    if (o == null) throw new Exception(@"Can't convert!");
+                    if (o == null) throw new HitObjectConvertException(@"Mania", i);
 
                     h = new Note
                     {
diff --git a/osu.Game/Beatmaps/Objects/Taiko/TaikoConverter.cs b/osu.Game/Beatmaps/Objects/Taiko/TaikoConverter.cs
index 3189a0dec7..d70e8f8406 100644
--- a/osu.Game/Beatmaps/Objects/Taiko/TaikoConverter.cs
+++ b/osu.Game/Beatmaps/Objects/Taiko/TaikoConverter.cs
@@ -21,7 +21,7 @@ namespace osu.Game.Beatmaps.Objects.Taiko
                 {
                     OsuBaseHit o = i as OsuBaseHit;
 
-                    if (o == null) throw new Exception(@"Can't convert!");
+                    if (o == null) throw new HitObjectConvertException(@"Taiko", i);
 
                     h = new TaikoBaseHit
                     {
diff --git a/osu.Game/GameModes/Play/Catch/CatchHitRenderer.cs b/osu.Game/GameModes/Play/Catch/CatchHitRenderer.cs
index d8e5aaaa35..3de1c34915 100644
--- a/osu.Game/GameModes/Play/Catch/CatchHitRenderer.cs
+++ b/osu.Game/GameModes/Play/Catch/CatchHitRenderer.cs
@@ -1,7 +1,6 @@
 //Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System.Collections.Generic;
 using osu.Framework.Graphics;
 using osu.Game.Beatmaps.Objects;
 using osu.Game.Beatmaps.Objects.Catch;
@@ -11,9 +10,9 @@ namespace osu.Game.GameModes.Play.Catch
 {
     public class CatchHitRenderer : HitRenderer<CatchBaseHit>
     {
-        protected override Playfield CreatePlayfield() => new CatchPlayfield();
+        protected override HitObjectConverter<CatchBaseHit> Converter => new CatchConverter();
 
-        protected override List<CatchBaseHit> Convert(List<HitObject> objects) => new CatchConverter().Convert(objects);
+        protected override Playfield CreatePlayfield() => new CatchPlayfield();
 
         protected override Drawable GetVisualRepresentation(CatchBaseHit h) => new DrawableFruit(h);
     }
diff --git a/osu.Game/GameModes/Play/HitRenderer.cs b/osu.Game/GameModes/Play/HitRenderer.cs
index b18d9ebb6d..53cca2072c 100644
--- a/osu.Game/GameModes/Play/HitRenderer.cs
+++ b/osu.Game/GameModes/Play/HitRenderer.cs
@@ -10,6 +10,7 @@ using osu.Framework;
 namespace osu.Game.GameModes.Play
 {
     public abstract class HitRenderer<T> : Container
+        where T : HitObject
     {
         private List<T> objects;
 
@@ -27,7 +28,9 @@ namespace osu.Game.GameModes.Play
 
         protected abstract Playfield CreatePlayfield();
 
-        protected abstract List<T> Convert(List<HitObject> objects);
+        protected abstract HitObjectConverter<T> Converter { get; }
+
+        protected virtual List<T> Convert(List<HitObject> objects) => Converter.Convert(objects);
 
         public override void Load(BaseGame game)
         {
diff --git a/osu.Game/GameModes/Play/Mania/ManiaHitRenderer.cs b/osu.Game/GameModes/Play/Mania/ManiaHitRenderer.cs
index 302f40878b..93b9a58822 100644
--- a/osu.Game/GameModes/Play/Mania/ManiaHitRenderer.cs
+++ b/osu.Game/GameModes/Play/Mania/ManiaHitRenderer.cs
@@ -1,12 +1,11 @@
 //Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
+using OpenTK;
 using osu.Framework.Graphics;
 using osu.Game.Beatmaps.Objects;
 using osu.Game.Beatmaps.Objects.Mania;
-using OpenTK;
 using osu.Game.Beatmaps.Objects.Mania.Drawable;
-using System.Collections.Generic;
 
 namespace osu.Game.GameModes.Play.Mania
 {
@@ -19,11 +18,7 @@ namespace osu.Game.GameModes.Play.Mania
             this.columns = columns;
         }
 
-        protected override List<ManiaBaseHit> Convert(List<HitObject> objects)
-        {
-            ManiaConverter converter = new ManiaConverter(columns);
-            return converter.Convert(objects);
-        }
+        protected override HitObjectConverter<ManiaBaseHit> Converter => new ManiaConverter(columns);
 
         protected override Playfield CreatePlayfield() => new ManiaPlayfield(columns);
 
diff --git a/osu.Game/GameModes/Play/Osu/OsuHitRenderer.cs b/osu.Game/GameModes/Play/Osu/OsuHitRenderer.cs
index 130d6d212f..331882da73 100644
--- a/osu.Game/GameModes/Play/Osu/OsuHitRenderer.cs
+++ b/osu.Game/GameModes/Play/Osu/OsuHitRenderer.cs
@@ -1,7 +1,6 @@
 //Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System.Collections.Generic;
 using osu.Framework.Graphics;
 using osu.Game.Beatmaps.Objects;
 using osu.Game.Beatmaps.Objects.Osu;
@@ -11,9 +10,9 @@ namespace osu.Game.GameModes.Play.Osu
 {
     public class OsuHitRenderer : HitRenderer<OsuBaseHit>
     {
-        protected override Playfield CreatePlayfield() => new OsuPlayfield();
+        protected override HitObjectConverter<OsuBaseHit> Converter => new OsuConverter();
 
-        protected override List<OsuBaseHit> Convert(List<HitObject> objects) => new OsuConverter().Convert(objects);
+        protected override Playfield CreatePlayfield() => new OsuPlayfield();
 
         protected override Drawable GetVisualRepresentation(OsuBaseHit h) => new DrawableCircle(h);
     }
diff --git a/osu.Game/GameModes/Play/Taiko/TaikoHitRenderer.cs b/osu.Game/GameModes/Play/Taiko/TaikoHitRenderer.cs
index 9fab5998f5..bee74d5451 100644
--- a/osu.Game/GameModes/Play/Taiko/TaikoHitRenderer.cs
+++ b/osu.Game/GameModes/Play/Taiko/TaikoHitRenderer.cs
@@ -1,7 +1,6 @@
 //Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System.Collections.Generic;
 using osu.Framework.Graphics;
 using osu.Game.Beatmaps.Objects;
 using osu.Game.Beatmaps.Objects.Taiko;
@@ -11,10 +10,10 @@ namespace osu.Game.GameModes.Play.Taiko
 {
     public class TaikoHitRenderer : HitRenderer<TaikoBaseHit>
     {
-        protected override List<TaikoBaseHit> Convert(List<HitObject> objects) => new TaikoConverter().Convert(objects);
+        protected override HitObjectConverter<TaikoBaseHit> Converter => new TaikoConverter();
 
         protected override Playfield CreatePlayfield() => new TaikoPlayfield();
 
         protected override Drawable GetVisualRepresentation(TaikoBaseHit h) => new DrawableTaikoHit(h);
     }
-}
\ No newline at end of file
+}
diff --git a/osu.Game/Online/Chat/Display/ChatLine.cs b/osu.Game/Online/Chat/Display/ChatLine.cs
index 5032ff0b9f..92146be0b2 100644
--- a/osu.Game/Online/Chat/Display/ChatLine.cs
+++ b/osu.Game/Online/Chat/Display/ChatLine.cs
@@ -43,7 +43,7 @@ namespace osu.Game.Online.Chat.Display
                         {
                             new SpriteText
                             {
-                                Text = Message.Timestamp.ToLocalTime().ToLongTimeString(),
+                                Text = Message.Timestamp.LocalDateTime.ToLongTimeString(),
                                 TextSize = text_size,
                                 Colour = new Color4(128, 128, 128, 255)
                             },
diff --git a/osu.Game/Online/Chat/Message.cs b/osu.Game/Online/Chat/Message.cs
index 5b344da22c..9fb9668f64 100644
--- a/osu.Game/Online/Chat/Message.cs
+++ b/osu.Game/Online/Chat/Message.cs
@@ -18,7 +18,7 @@ namespace osu.Game.Online.Chat
         public int ChannelId;
 
         [JsonProperty(@"timestamp")]
-        public DateTime Timestamp;
+        public DateTimeOffset Timestamp;
 
         [JsonProperty(@"content")]
         public string Content;