DatetimeOffset input - fix automatic modification to local time

Author: Milos

src/Examples/JsonApiDotNetCoreExample/Models/TodoItem.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using JsonApiDotNetCore.Models;
 
 namespace JsonApiDotNetCoreExample.Models
@@ -25,12 +25,12 @@ public TodoItem()
         [Attr("achieved-date", isFilterable: false, isSortable: false)]
         public DateTime? AchievedDate { get; set; }
 
-
         [Attr("updated-date")]
         public DateTime? UpdatedDate { get; set; }
 
-
-        
+        [Attr("offset-date")]
+        public DateTimeOffset? OffsetDate { get; set; }
+ 
         public int? OwnerId { get; set; }
         public int? AssigneeId { get; set; }
         public Guid? CollectionId { get; set; }

src/JsonApiDotNetCore/Serialization/JsonApiDeSerializer.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Reflection;
 using JsonApiDotNetCore.Extensions;
@@ -36,8 +37,12 @@ public object Deserialize(string requestBody)
         {
             try
             {
-                var bodyJToken = JToken.Parse(requestBody);
-
+                JToken bodyJToken;
+                using (JsonReader jsonReader = new JsonTextReader(new StringReader(requestBody)))
+                {
+                    jsonReader.DateParseHandling = DateParseHandling.None;
+                    bodyJToken = JToken.Load(jsonReader);
+                }
                 if (RequestIsOperation(bodyJToken))
                 {
                     _jsonApiContext.IsBulkOperationRequest = true;

test/JsonApiDotNetCoreExampleTests/Acceptance/TodoItemsControllerTests.cs

@@ -404,6 +404,7 @@ public async Task Can_Post_TodoItem()
             _context.SaveChanges();
 
             var todoItem = _todoItemFaker.Generate();
+            var nowOffset = new DateTimeOffset();
             var content = new
             {
                 data = new
@@ -413,7 +414,8 @@ public async Task Can_Post_TodoItem()
                     {
                         { "description", todoItem.Description },
                         { "ordinal", todoItem.Ordinal },
-                        { "created-date", todoItem.CreatedDate }
+                        { "created-date", todoItem.CreatedDate },
+                        { "offset-date", nowOffset }
                     },
                     relationships = new
                     {
@@ -446,6 +448,7 @@ public async Task Can_Post_TodoItem()
             Assert.Equal(HttpStatusCode.Created, response.StatusCode);
             Assert.Equal(todoItem.Description, deserializedBody.Description);
             Assert.Equal(todoItem.CreatedDate.ToString("G"), deserializedBody.CreatedDate.ToString("G"));
+            Assert.Equal(nowOffset.ToString("yyyy-MM-ddTHH:mm:ssK"), deserializedBody.OffsetDate?.ToString("yyyy-MM-ddTHH:mm:ssK"));
             Assert.Null(deserializedBody.AchievedDate);
         }