using System;
using System.Globalization;

namespace ProgramConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = "2005";
            DateTime dt;
            if(DateTime.TryParseExact(s, "yyyy", CultureInfo.InvariantCulture,
                                      DateTimeStyles.None, out dt))
            {
                Console.WriteLine(dt);
            }
        }
    }
}