using System;

public class Program

{

    public static void Main()

    {

        DateTime dt = new DateTime(2020, 2,14);

        DateTime dt2 = new DateTime(1984,2,21);

        var years = dt.Year - dt2.Year;

        var monthes = dt.Month - dt2.Month;

        var days = dt.Day - dt2.Day;    

        var x = new DateTime(years, 1,1);

        Console.WriteLine(x);

        var z = x.AddMonths(monthes);

        z = z.AddDays(days);

        Console.WriteLine(z);

    }

}