using System;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        string dateString = "Fri, 16 May 2015 05:50:06 GMT";

        string format = "ddd, dd MMM yyy HH’:’mm’:’ss ‘GMT’";

        DateTime date = DateTime.ParseExact(dateString, format, CultureInfo.InvariantCulture);

        Console.WriteLine(date);

    }

}