using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var obj = JsonConvert.DeserializeObject<DateObj>("{\"date\":\"2018-01-01T01:00:00+02\"}");

        Console.WriteLine(obj.date);

    }

}

​

class DateObj {

    public string date {get;set;}

}