gistfile1.txt

[mono-20141210094159]directhex@marceline:/tmp$ mono --version
Mono JIT compiler version 3.99.0 (tarball Wed Dec 10 17:02:24 UTC 2014)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
	TLS:           __thread
	SIGSEGV:       altstack
	Notifications: epoll
	Architecture:  amd64
	Disabled:      none
	Misc:          softdebug 
	LLVM:          supported, not enabled.
	GC:            sgen
[mono-20141210094159]directhex@marceline:/tmp$ mono test.exe 
en_US w/ componentmodel: 12/31/2008 11:59 pm
en_US direct: 12/31/2008 11:59:58 PM
en_GB w/ componentmodel: 31/12/2008 23:59
en_GB direct: 31/12/2008 23:59:58

gistfile2.txt

directhex@marceline:/tmp$ mono --version
Mono JIT compiler version 3.10.0 (tarball Wed Nov  5 12:50:04 UTC 2014)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
	TLS:           __thread
	SIGSEGV:       altstack
	Notifications: epoll
	Architecture:  amd64
	Disabled:      none
	Misc:          softdebug 
	LLVM:          supported, not enabled.
	GC:            sgen
directhex@marceline:/tmp$ mono test.exe 
en_US w/ componentmodel: 12/31/2008 11:59 PM
en_US direct: 12/31/2008 11:59:58 PM
en_GB w/ componentmodel: 31/12/2008 23:59
en_GB direct: 31/12/2008 23:59:58

test.cs

using System;
using System.Globalization;
using System.ComponentModel;

class Test{
   static void Main(){
      DateTimeConverter converter = new DateTimeConverter ();
      DateTime date = new DateTime(2008, 12, 31, 23, 59, 58, 5);

      CultureInfo ci = new CultureInfo("en-US");
      Console.WriteLine("en_US w/ componentmodel: {0}",converter.ConvertTo(null, ci, date, typeof(String)));
      Console.WriteLine("en_US direct: {0}", date.ToString(ci));

      CultureInfo ci2 = new CultureInfo("en-GB");
      Console.WriteLine("en_GB w/ componentmodel: {0}",converter.ConvertTo(null, ci2, date, typeof(String)));
      Console.WriteLine("en_GB direct: {0}", date.ToString(ci2));
   }
}