using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.Reflection;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/53326681/sorting-jobject-inside-array-by-a-field-value

​

    class TestClass

    {

        public static void Test()

        {

            var data = GetJson();

            // Load the JSON without parsing or converting any dates.

            var model = JsonConvert.DeserializeObject<JObject>(data, new JsonSerializerSettings{ DateParseHandling = DateParseHandling.None });

​

            Console.WriteLine("Input model: ");

            Console.WriteLine(model);

            // Construct a serializer that converts all DateTime values to UTC

            var serializer = JsonSerializer.CreateDefault(new JsonSerializerSettings{ DateTimeZoneHandling = DateTimeZoneHandling.Utc });

            foreach (var locations in model.SelectTokens("Result[*].locations").OfType<JArray>())

            {

                // Then sort the locations by utcDate converting the value to UTC at this time.

                var query = from location in locations

                            let utcDate = location.SelectToken("locTypeAttributes.utcDate").ToObject<DateTime>(serializer)

                            orderby utcDate

                            select location;

                locations.ReplaceAll(query.ToList());

            }

            Console.WriteLine("\nSorted model: ");

            Console.WriteLine(model);

        }   

        static string GetJson()

        {

            var json = @"{

  ""MetaData"": {

    ""ResourcesUsed"": 1

  },

  ""Result"": [

    {

      ""locations"": [

        {

          ""country"": ""Papua New Guinea"",

          ""city"": ""Jacquinot Bay"",

          ""locTypeAttributes"": {

            ""localDate"": ""2018-10-08T04:21:00-07:00"",

            ""utcDate"": ""2018-10-08T04:21:00-07:00"",

          },

          ""point"": {

            ""coordinates"": [

              151.52,

              -5.6

            ],

            ""type"": ""Point""

          }

        },{

          ""country"": ""Papua New Guinea2"",

          ""city"": ""Jacquinot Bay2"",

          ""locTypeAttributes"": {

            ""localDate"": ""2018-10-08T04:21:00-07:00"",

            ""utcDate"": ""2018-10-02T04:21:00-07:00"",

          },

          ""point"": {

            ""coordinates"": [

              151.52,

              -5.6

            ],

            ""type"": ""Point""

          }

        }

      ]

    }

  ]

}

";

            return json;

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: " + Environment.Version);

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​

#if false

Do you want to sort the `"Result": []` array, or do you want to sort each `"Result[*].locations"` array?  Because the locations themselves are an array so there might in principle be more than one, each with its own `utcDate`.  And if you do want to sort the `"Results"` array how do you want to deal with the situation where a result has multiple locations with multiple `utcDate` values?  [C# Sort JSON string keys](https://stackoverflow.com/q/14417235/3744182) is for recursively sorting a tree of objects by property name so it doesn't really apply here.

#endif

​