using System;

​

public class Person

{

    private DateTime _birthdate;

    public void SetBirthdate(DateTime birthdate)

    {

        _birthdate = birthdate;

    }

    public DateTime GetBirthdate()

    {

        return _birthdate;

    }

}

public class Program

{

    public static void Main()

    {

        var person = new Person();

        person.SetBirthdate(new DateTime(1985,1,1));

        Console.WriteLine(person.GetBirthdate());

    }

}