using System;

using Newtonsoft.Json;

​

public class Program

{

    public static void Main()

    {

        var input = "{\"email\":\"myemail@testdomain.com\", \"expiry\": \"2018-03-19T23:00:03.0658822+01:00\"}";

        var template = new { email = "", expiry = DateTimeOffset.Now };

        var result = JsonConvert.DeserializeAnonymousType(input, template);

        Console.WriteLine("DateTime (GMT): {0:R}\r\nOffset from GMT: {1}", result.expiry, result.expiry.Offset);

    }

}