using System;
using System.Globalization;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
		string dateTimeString = "21‎-‎10‎-‎2014‎ ‎15‎:‎40‎:‎30";
		dateTimeString = Regex.Replace(dateTimeString, @"[^\u0000-\u007F]", string.Empty);
 
		string inputFormat = "dd-MM-yyyy HH:mm:ss";
		string outputFormat = "yyyy-MM-dd HH:mm:ss";
		var dateTime = DateTime.ParseExact(dateTimeString, inputFormat, CultureInfo.InvariantCulture);
		string output = dateTime.ToString(outputFormat);
 
		Console.WriteLine(output);
	}
}

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