-Changed JSON Date constructors to automatically deserialize to a date

Src/Newtonsoft.Json.Tests/JsonSerializerTest.cs

@@ -1324,6 +1324,39 @@ keyword such as type of business.""
       Assert.AreEqual(@"{}", json);
     }
 
+    public class Invoice
+    {
+      public string Company { get; set; }
+      public decimal Amount { get; set; }
+      [DefaultValue(false)]
+      public bool Paid { get; set; }
+      [DefaultValue(null)]
+      public DateTime? PaidDate { get; set; }
+    }
+
+    [Test]
+    public void SerializeInvoice()
+    {
+      Invoice invoice = new Invoice
+                        {
+                          Company = "Acme Ltd.",
+                          Amount = 50.0m,
+                          Paid = false
+                        };
+
+      string json = JavaScriptConvert.SerializeObject(invoice);
+
+      Console.WriteLine(json);
+      // {"Company":"Acme Ltd.","Amount":50.0,"Paid":false,"PaidDate":null}
+
+      json = JavaScriptConvert.SerializeObject(invoice,
+        Formatting.None,
+        new JsonSerializerSettings { DefaultValueHandling = DefaultValueHandling.Ignore });
+
+      Console.WriteLine(json);
+      // {"Company":"Acme Ltd.","Amount":50.0}
+    }
+
     [Test]
     public void DeserializeNullable()
     {

Src/Newtonsoft.Json.Tests/Linq/JObjectTests.cs

@@ -4,6 +4,8 @@ using System.Linq;
 using System.Text;
 using NUnit.Framework;
 using Newtonsoft.Json.Linq;
+using Newtonsoft.Json.Converters;
+using System.IO;
 
 namespace Newtonsoft.Json.Tests.Linq
 {
@@ -317,5 +319,16 @@ Parameter name: arrayIndex")]
       string json = @"[""prop""]";
       JObject.Parse(json);
     }
+
+    [Test]
+    public void ParseJavaScriptDate()
+    {
+      string json = @"[new Date(1207285200000)]";
+
+      JArray a = (JArray)JavaScriptConvert.DeserializeObject(json, null);
+      JValue v = (JValue)a[0];
+
+      Assert.AreEqual(JavaScriptConvert.ConvertJavaScriptTicksToDateTime(1207285200000), (DateTime)v);
+    }
   }
 }

Src/Newtonsoft.Json.Tests/PerformanceTests.cs

@@ -20,7 +20,7 @@ namespace Newtonsoft.Json.Tests
   /// </summary>
   public class PerformanceTests : TestFixtureBase
   {
-    private int Iterations = 100;
+    private int Iterations = 5000;
 
     public enum SerializeMethod
     {

Src/Newtonsoft.Json/JsonWriter.cs

@@ -333,7 +333,12 @@ namespace Newtonsoft.Json
             WriteStartArray();
             break;
           case JsonToken.StartConstructor:
-            WriteStartConstructor(reader.Value.ToString());
+            string constructorName = reader.Value.ToString();
+            // write a JValue date when the constructor is for a date
+            if (string.Compare(constructorName, "Date", StringComparison.Ordinal) == 0)
+              WriteConstructorDate(reader);
+            else
+              WriteStartConstructor(reader.Value.ToString());
             break;
           case JsonToken.PropertyName:
             WritePropertyName(reader.Value.ToString());
@@ -384,6 +389,24 @@ namespace Newtonsoft.Json
         && reader.Read());
     }
 
+    private void WriteConstructorDate(JsonReader reader)
+    {
+      if (!reader.Read())
+        throw new Exception("Unexpected end while reading date constructor.");
+      if (reader.TokenType != JsonToken.Integer)
+        throw new Exception("Unexpected token while reading date constructor. Expected Integer, got " + reader.TokenType);
+
+      long ticks = (long)reader.Value;
+      DateTime date = JavaScriptConvert.ConvertJavaScriptTicksToDateTime(ticks);
+
+      if (!reader.Read())
+        throw new Exception("Unexpected end while reading date constructor.");
+      if (reader.TokenType != JsonToken.EndConstructor)
+        throw new Exception("Unexpected token while reading date constructor. Expected EndConstructor, got " + reader.TokenType);
+
+      WriteValue(date);
+    }
+
     private bool IsEndToken(JsonToken token)
     {
       switch (token)