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DateTime.Parse ignoring my IFormatProvider?

Tag: c#,.net,parsing,datetime

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

Best How To :

If you follow through the reference source you'll see that DateTimeFormatInfo is extracted from your CultureInfo by simply referencing CultureInfo.DateTimeFormat.

There is a Calendar property on DateTimeFormatInfo, which is what is used in parsing. These two are normally the same (i.e. reference equal), the fact you Clone your CultureInfo results in them being different as each are cloned - you can see that by following through the reference source for CultureInfo.Clone().

You need to change the Calendar on the DateTimeFormatInfo:

var culture = (CultureInfo)Thread.CurrentThread.CurrentCulture.Clone();
culture.DateTimeFormat.Calendar.TwoDigitYearMax = 2115;

See a working example here: https://dotnetfiddle.net/IytEvz

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