diff --git a/src/Microsoft.AspNetCore.Blazor/Json/SimpleJson/SimpleJson.cs b/src/Microsoft.AspNetCore.Blazor/Json/SimpleJson/SimpleJson.cs
index 70f824da12..01075b22e8 100644
--- a/src/Microsoft.AspNetCore.Blazor/Json/SimpleJson/SimpleJson.cs
+++ b/src/Microsoft.AspNetCore.Blazor/Json/SimpleJson/SimpleJson.cs
@@ -1353,7 +1353,8 @@ namespace SimpleJson
                         return DateTime.TryParseExact(str, Iso8601Format, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal, out var result)
                             ? result : DateTime.Parse(str, CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind);
                     if (type == typeof(DateTimeOffset) || (ReflectionUtils.IsNullableType(type) && Nullable.GetUnderlyingType(type) == typeof(DateTimeOffset)))
-                        return DateTimeOffset.ParseExact(str, Iso8601Format, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal);
+                        return DateTimeOffset.TryParseExact(str, Iso8601Format, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal, out var result)
+                            ? result : DateTimeOffset.Parse(str, CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind);
                     if (type == typeof(Guid) || (ReflectionUtils.IsNullableType(type) && Nullable.GetUnderlyingType(type) == typeof(Guid)))
                         return new Guid(str);
                     if (type == typeof(Uri))
@@ -1484,7 +1485,7 @@ namespace SimpleJson
             if (input is DateTime)
                 output = ((DateTime)input).ToUniversalTime().ToString(Iso8601Format[0], CultureInfo.InvariantCulture);
             else if (input is DateTimeOffset)
-                output = ((DateTimeOffset)input).ToUniversalTime().ToString(Iso8601Format[0], CultureInfo.InvariantCulture);
+                output = ((DateTimeOffset)input).ToString("o");
             else if (input is Guid)
                 output = ((Guid)input).ToString("D");
             else if (input is Uri)
diff --git a/test/Microsoft.AspNetCore.Blazor.Test/JsonUtilTest.cs b/test/Microsoft.AspNetCore.Blazor.Test/JsonUtilTest.cs
index 2f064d29e4..5f2e883cb6 100644
--- a/test/Microsoft.AspNetCore.Blazor.Test/JsonUtilTest.cs
+++ b/test/Microsoft.AspNetCore.Blazor.Test/JsonUtilTest.cs
@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Collections.Generic;
 using Xunit;
 
@@ -49,12 +50,13 @@ namespace Microsoft.AspNetCore.Blazor.Test
                 Name = "Athos",
                 Pets = new[] { "Aramis", "Porthos", "D'Artagnan" },
                 Hobby = Hobbies.Swordfighting,
-                Nicknames = new List<string> { "Comte de la Fère", "Armand" }
+                Nicknames = new List<string> { "Comte de la Fère", "Armand" },
+                BirthInstant = new DateTimeOffset(1825, 8, 6, 18, 45, 21, TimeSpan.FromHours(-6))
             };
 
             // Act/Assert
             Assert.Equal(
-                "{\"Id\":1844,\"Name\":\"Athos\",\"Pets\":[\"Aramis\",\"Porthos\",\"D'Artagnan\"],\"Hobby\":2,\"Nicknames\":[\"Comte de la Fère\",\"Armand\"]}",
+                "{\"Id\":1844,\"Name\":\"Athos\",\"Pets\":[\"Aramis\",\"Porthos\",\"D'Artagnan\"],\"Hobby\":2,\"Nicknames\":[\"Comte de la Fère\",\"Armand\"],\"BirthInstant\":\"1825-08-06T18:45:21.0000000-06:00\"}",
                 JsonUtil.Serialize(person));
         }
 
@@ -62,7 +64,7 @@ namespace Microsoft.AspNetCore.Blazor.Test
         public void CanDeserializeClassFromJson()
         {
             // Arrange
-            var json = "{\"Id\":1844,\"Name\":\"Athos\",\"Pets\":[\"Aramis\",\"Porthos\",\"D'Artagnan\"],\"Hobby\":2,\"Nicknames\":[\"Comte de la Fère\",\"Armand\"]}";
+            var json = "{\"Id\":1844,\"Name\":\"Athos\",\"Pets\":[\"Aramis\",\"Porthos\",\"D'Artagnan\"],\"Hobby\":2,\"Nicknames\":[\"Comte de la Fère\",\"Armand\"],\"BirthInstant\":\"1825-08-06T18:45:21.0000000-06:00\"}";
 
             // Act
             var person = JsonUtil.Deserialize<Person>(json);
@@ -73,6 +75,7 @@ namespace Microsoft.AspNetCore.Blazor.Test
             Assert.Equal(new[] { "Aramis", "Porthos", "D'Artagnan" }, person.Pets);
             Assert.Equal(Hobbies.Swordfighting, person.Hobby);
             Assert.Equal(new[] { "Comte de la Fère", "Armand" }, person.Nicknames);
+            Assert.Equal(new DateTimeOffset(1825, 8, 6, 18, 45, 21, TimeSpan.FromHours(-6)), person.BirthInstant);
         }
 
         class Person
@@ -82,6 +85,7 @@ namespace Microsoft.AspNetCore.Blazor.Test
             public string[] Pets { get; set; }
             public Hobbies Hobby { get; set; }
             public IList<string> Nicknames { get; set; }
+            public DateTimeOffset BirthInstant { get; set; }
         }
 
         enum Hobbies { Reading = 1, Swordfighting = 2 }