DateTime.ToString() inconsistency between Windows and macOS

[danipen]

I have a simple code snippet in C#:

Console.WriteLine("Hello, World!: " + DateTime.Now.ToString());

When I change the system settings, the output differs between Windows and macOS platforms.

On Windows, it respects the system settings as expected:

However, on macOS, it doesn't follow the system settings:

Any insights or solutions would be appreciated. Thanks!

[huoyaoyuan]

See #61148

[tarekgh]

CC @steveisok