Debug.WriteLine() versus Console.WriteLine() handles culture differently. Why?

Question

Consider the following Console App code:

Thread.CurrentThread.CurrentCulture = new CultureInfo("en-GB");
Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture;

DateTime date = new DateTime(2014, 01, 19);

Console.WriteLine("{0}", date); // Prints 19/01/2014
Debug.WriteLine("{0}", date);   // Prints 01/19/2014
Debug.WriteLine(date);          // Prints 19/01/2014

As noted in the comments, the Console.WriteLine() prints 19/01/2014 while the Debug.WriteLine() prints 01/19/2014.

Even worse - Debug.WriteLine("{0}", date) gives different output from Debug.WriteLine(date)...

Is it expected that Debug.WriteLine() ignores the thread's culture settings?

Is there a way to make Debug.WriteLine() use the thread's culture settings? Or must I use String.Format() and pass the result to Debug.WriteLine()?

(Note: I'm running this on Windows 8.1 64-bit, en-GB, using Visual Studio 2013 with .Net 4.51 with a debug AnyCPU build.)

Answer 1

This is explicitly handled in the source.

It makes sense, too.
Debug output should not be affected by the end-users culture; you want your debug logs to be consistent no matter where the code is running.

Answer 2

The overload you are using explicitly ignores the culture by using InvariantCulture:

public static void WriteLine(string format, params object[] args) 
{
    TraceInternal.WriteLine(String.Format(CultureInfo.InvariantCulture, format, args));
}

All the other overloads don't do anything related to culture. You can "workaround" this by using the overload which takes a string:

public static void WriteLine(string message, string category)
{
    TraceInternal.WriteLine(message, category);
}

By doing this:

Thread.CurrentThread.CurrentCulture = new CultureInfo("en-GB");
Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture;

DateTime date = new DateTime(2014, 01, 19);

var formatedDate = string.Format("{0}", date);
Console.WriteLine(formatedDate);
Debug.WriteLine(formatedDate);

Now both print:

19/01/2014 00:00:00 
19/01/2014 00:00:00