static void Main(string[] args)
        {
            var person = new Person();
            person.SetBirthdate(new DateTime(1982, 1, 1));
            Console.WriteLine(person.GetBirthdate());

        }
 static void Main(string[] args)
 {
     var person1 = new Person();
     person1.SetBirthday(new DateTime(1991, 12, 4));
     Console.WriteLine(person1.GetBirthday().ToString().TrimEnd("00:00:00".ToCharArray()));
 }
 static void Main(string[] args)
 {
     var person = new Person();
     person.BirthDate = new DateTime(1992,1,1);
     Console.WriteLine(person.BirthDate);
 }