It looks to me like .NET is ignoring the TwoDigitYearMax property of the CultureInfo (IFormatProvider) I pass for parsing?

Specifically, I cannot explain why the last line of this says 1930, and not 2030. Can anyone reproduce or explain it?

Windows 7, .NET 4.0, en-US system settings.

using System;
using System.Globalization;

namespace DateTimeParse
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(System.Threading.Thread.CurrentThread.CurrentCulture.Calendar.TwoDigitYearMax);
            Console.WriteLine(System.Threading.Thread.CurrentThread.CurrentCulture);
            Console.WriteLine(DateTime.Parse("1/1/30"));
            CultureInfo myCI = (CultureInfo)System.Threading.Thread.CurrentThread.CurrentCulture.Clone();
            Console.WriteLine(DateTime.Parse("1/1/30", myCI));
            Console.WriteLine(System.Threading.Thread.CurrentThread.CurrentCulture.Calendar.ToFourDigitYear(30));
            myCI.Calendar.TwoDigitYearMax = 2115;
            Console.WriteLine(myCI.Calendar.ToFourDigitYear(30));
            Console.WriteLine(DateTime.Parse("1/1/30", myCI));
            Console.ReadLine();
        }
    }
}

My results:

2029
en-US
1/1/1930 12:00:00 AM
1/1/1930 12:00:00 AM
1930
2030
1/1/1930 12:00:00 AM