using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        string inputDateString = "05 05 2014"; // Replace this with your date string

        DateTime parsedDate;

        if (DateTime.TryParseExact(inputDateString, 

            new string[] { "MM/dd/yyyy", "yyyy-MM-dd", "dd.MM.yyyy", "yyyyMMdd" , "yyyy", "MM yyyy", "dd MM yyyy"}, 

            CultureInfo.InvariantCulture, 

            DateTimeStyles.None, 

            out parsedDate))

        {

            string formattedDate = parsedDate.ToString("yyyy-MM-dd");

            Console.WriteLine(formattedDate);

        }

        else

        {

            Console.WriteLine("Invalid date format");

        }

    }

}