adds support for datetime (universal format only

src/JSONParser.cs

@@ -243,6 +243,12 @@ internal static object ParseValue(Type type, string json)
                 }
                 return dictionary;
             }
+            if (type == typeof(DateTime))
+            {
+                DateTime result;
+                DateTime.TryParse(json, System.Globalization.DateTimeFormatInfo.InvariantInfo, System.Globalization.DateTimeStyles.AssumeUniversal, out result);
+                return result;
+            }
             if (type == typeof(object))
             {
                 return ParseAnonymousValue(json);

src/JSONWriter.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Reflection;
 using System.Runtime.Serialization;
 using System.Text;
@@ -71,7 +72,7 @@ static void AppendValue(StringBuilder stringBuilder, object item)
             {
                 stringBuilder.Append(((double)item).ToString(System.Globalization.CultureInfo.InvariantCulture));
             }
-            else if (type == typeof(decimal))
+            else if (type == typeof(decimal))
             {
                 stringBuilder.Append(((decimal)item).ToString(System.Globalization.CultureInfo.InvariantCulture));
             }
@@ -127,6 +128,10 @@ static void AppendValue(StringBuilder stringBuilder, object item)
                 }
                 stringBuilder.Append('}');
             }
+            else if (item is DateTime time)
+            {
+                stringBuilder.Append(time.ToString(CultureInfo.InvariantCulture));
+            }
             else
             {
                 stringBuilder.Append('{');

test/TestParser.cs

@@ -38,6 +38,7 @@ static void Test<T>(T expected, string json)
         [TestMethod]
         public void TestValues()
         {
+            Test(new DateTime(), "01/01/0001 00:00:00");
             Test(12345, "12345");
             Test(12345L, "12345");
             Test(12345UL, "12345");
@@ -296,15 +297,15 @@ public void TestEscaping()
         }
 
         [TestMethod]
-        public void TestMultithread()
+        public void TestMultithread()
         {
             // Lots of threads
-            for (int i = 0; i < 100; i++)
+            for (int i = 0; i < 100; i++)
             {
-                new Thread(() =>
+                new Thread(() =>
                 {
                     // Each threads has enough work to potentially hit a race condition
-                    for (int j = 0; j < 10000; j++)
+                    for (int j = 0; j < 10000; j++)
                     {
                         TestValues();
                         TestArrayOfValues();

test/TestWriter.cs

@@ -30,6 +30,7 @@ public enum Style
         [TestMethod]
         public void TestValues()
         {
+            Assert.AreEqual(new DateTime().ToJson(), "01/01/0001 00:00:00");
             Assert.AreEqual("\"\u94b1\u4e0d\u591f!\"", "\u94b1\u4e0d\u591f!".ToJson());
             Assert.AreEqual("123", 123.ToJson());
             Assert.AreEqual("true", true.ToJson());