using System;

using Newtonsoft.Json;

​

public class MyDate

{

    public int year;

    public int month;

    public int day;

}

​

public class Lad

{

    public string firstName;

    public string lastName;

    public MyDate dateOfBirth;

    public Double test;

    public DateTime currenttime;

}

​

public class Program

{

    public void Main()

    {

        var obj = new Lad

        {

            firstName = "Markoff",

            lastName = "Chaney",

            dateOfBirth = new MyDate

            {

                year = 1901,

                month = 4,

                day = 30

            },

            test = 5.0,

            currenttime = DateTime.Now

        };

       Console.WriteLine(JsonConvert.SerializeObject(obj));

    }

}