using System;

public class Program

{

    public static void Main()

    {

         DateTime dateTime = DateTime.Now;

         string rawValue = "20170726T015300Z";

         string rawValue2 = "20170726T135300Z";

​

         if (DateTime.TryParseExact(rawValue, "yyyyMMdd'T'HHmmss'Z'", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None, out dateTime))

         {

             Console.WriteLine($"{nameof(rawValue)}: {dateTime}");

         }

         if (DateTime.TryParseExact(rawValue2, "yyyyMMdd'T'HHmmss'Z'", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None, out dateTime))

         {

             Console.WriteLine($"{nameof(rawValue2)}: {dateTime}");

         }

    }

}