using System;

using System.Console;   

using System.Globalization;

​

namespace ConsoleApplication4 {

    public class Program {

        public static void Main(string[] args) {

            string data = @"2015-02-24T01:00:01-01:00";

​

            WriteLine(DateTime.ParseExact(data, "yyyy-MM-ddTHH:mm:sszzz", CultureInfo.InvariantCulture));//CONVERTE ERRADO

            WriteLine(DateTime.Parse(data));//CONVERTE ERRADO

​

​

            WriteLine((DateTime?)Convert.ChangeType(data, Nullable.GetUnderlyingType(typeof(DateTime?))));//CONVERT ERRADO

            WriteLine((DateTime)Convert.ChangeType(data, typeof(DateTime)));//CONVERT ERRADO

​

        }

    }

}