using System;

using System.Globalization;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string json = @"{ 

                ""date1"" : ""1939-01-08T00:00:00+01:00"",

                ""date2"" : ""1939-09-01T00:00:00-01:00"",

                ""date3"" : ""1940-07-10T00:00:00Z"",

                ""date4"" : ""1944-06-06T00:00:00""

            }";

        JsonSerializerSettings settings = new JsonSerializerSettings();

        settings.DateParseHandling = DateParseHandling.None;

        settings.Converters.Add(new OffsetIgnoringDateConverter());

        DateTest dt = JsonConvert.DeserializeObject<DateTest>(json, settings);

        Console.WriteLine("Date1: " + dt.Date1.ToString("dd-MMM-yyyy"));

        Console.WriteLine("Date2: " + dt.Date2.ToString("dd-MMM-yyyy"));

        Console.WriteLine("Date3: " + dt.Date3.ToString("dd-MMM-yyyy"));

        Console.WriteLine("Date4: " + dt.Date4.ToString("dd-MMM-yyyy"));

    }

}

​

class DateTest

{

    public DateTime Date1 { get; set; }

    public DateTime Date2 { get; set; }

    public DateTime Date3 { get; set; }

    public DateTime Date4 { get; set; }

}

​

class OffsetIgnoringDateConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return (objectType == typeof(DateTime) || objectType == typeof(DateTime?));

    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

    {

        string rawDate = (string)reader.Value;

        if (rawDate == null) return existingValue;

        if (rawDate.Length > 19) rawDate = rawDate.Substring(0, 19);

        DateTime date = DateTime.ParseExact(rawDate, "yyyy'-'MM'-'dd'T'HH':'mm':'ss", CultureInfo.CurrentCulture, DateTimeStyles.AssumeLocal);

        return date;

    }

    public override bool CanWrite

    {

        get { return false; }

    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

    {

        throw new NotImplementedException();

    }

}

​