-Fixed unit test failing because of timezones

-Added IsValid overload that returns a list of error messages

Src/Newtonsoft.Json.Tests/PerformanceTests.cs

@@ -39,8 +39,8 @@ namespace Newtonsoft.Json.Tests
 
   public class PerformanceTests : TestFixtureBase
   {
-    //private const int Iterations = 100;
-    private const int Iterations = 5000;
+    private const int Iterations = 100;
+    //private const int Iterations = 5000;
 
     #region Data
 

Src/Newtonsoft.Json.Tests/Schema/ExtensionsTests.cs

@@ -47,8 +47,15 @@ namespace Newtonsoft.Json.Tests.Schema
       JToken stringToken = JToken.FromObject("pie");
       JToken integerToken = JToken.FromObject(1);
 
-      Assert.AreEqual(false, stringToken.IsValid(schema));
+      IList<string> errorMessages;
       Assert.AreEqual(true, integerToken.IsValid(schema));
+      Assert.AreEqual(true, integerToken.IsValid(schema, out errorMessages));
+      Assert.AreEqual(0, errorMessages.Count);
+
+      Assert.AreEqual(false, stringToken.IsValid(schema));
+      Assert.AreEqual(false, stringToken.IsValid(schema, out errorMessages));
+      Assert.AreEqual(1, errorMessages.Count);
+      Assert.AreEqual("Invalid type. Expected Integer but got String.", errorMessages[0]);
     }
 
     [Test]

Src/Newtonsoft.Json.Tests/Serialization/TypeNameHandlingTests.cs

@@ -856,6 +856,7 @@ namespace Newtonsoft.Json.Tests.Serialization
     public void ByteArrays()
     {
       Car testerObject = new Car();
+      testerObject.Year = new DateTime(2000, 10, 5, 1, 1, 1, DateTimeKind.Utc);
       byte[] data = new byte[] {75, 65, 82, 73, 82, 65};
       testerObject.Objects = new object[] { data, "prueba" };
 
@@ -869,7 +870,7 @@ namespace Newtonsoft.Json.Tests.Serialization
 
       Assert.AreEqual(output, @"{
   ""$type"": """ + carClassRef + @""",
-  ""Year"": ""\/Date(-62135596800000+1300)\/"",
+  ""Year"": ""\/Date(970707661000)\/"",
   ""Objects"": {
     ""$type"": ""System.Object[], mscorlib"",
     ""$values"": [

Src/Newtonsoft.Json/Schema/Extensions.cs

@@ -52,6 +52,25 @@ namespace Newtonsoft.Json.Schema
       return valid;
     }
 
+    /// <summary>
+    /// Determines whether the <see cref="JToken"/> is valid.
+    /// </summary>
+    /// <param name="source">The source <see cref="JToken"/> to test.</param>
+    /// <param name="schema">The schema to test with.</param>
+    /// <param name="errorMessages">When this method returns, contains any error messages generated while validating. </param>
+    /// <returns>
+    /// 	<c>true</c> if the specified <see cref="JToken"/> is valid; otherwise, <c>false</c>.
+    /// </returns>
+    public static bool IsValid(this JToken source, JsonSchema schema, out IList<string> errorMessages)
+    {
+      IList<string> errors = new List<string>();
+
+      source.Validate(schema, (sender, args) => errors.Add(args.Message));
+
+      errorMessages = errors;
+      return (errorMessages.Count == 0);
+    }
+
     /// <summary>
     /// Validates the specified <see cref="JToken"/>.
     /// </summary>