using System;

using System.Collections.Generic;

using System.Text.Json.Serialization;

using Newtonsoft.Json;

using Newtonsoft.Json.Serialization;

using Newtonsoft.Json.Converters;

​

public class Program

{

    public static void Main()

    {

        string json = GetJson();

        var settings = new JsonSerializerSettings{ContractResolver = new DefaultContractResolver{NamingStrategy = new SnakeCaseNamingStrategy(), }};

        settings.Converters.Add(new IsoDateTimeConverter{DateTimeFormat = "yyyy-MM-dd HH:mm:ss"});

        var result = Newtonsoft.Json.JsonConvert.DeserializeObject<Root>(json, settings);

        Console.WriteLine(result.Order.CreatedAt.ToString("yyyy-MM-dd hh:mm:ss tt"));

    }

​

    private static string GetJson()

    {

        string json = @"{

        ""order"": {

            ""created_at"": ""2015-11-29T13:15:27+00:00"",

        }

    }";

        return json;

    }

}

​

// Root myDeserializedClass = JsonSerializer.Deserialize<Root>(myJsonResponse);

public class Order

{

    [JsonPropertyName("created_at")]

    public DateTime CreatedAt

    {

        get;

        set;

    }

}

​

public class Root

{

    [JsonPropertyName("order")]

    public Order Order

    {

        get;

        set;

    }

}