I think people are greatly misunderstanding why those standards exist. ISO 8601 is a building block for other standards (and itself builds upon other obsolete s

I think people are greatly misunderstanding why those standards exist. ISO 8601 is a building block for other standards (and itself builds upon other obsolete standards). If ISO 8601 is not a good fit for your application, you have no obligation to use it. But if you don't have a very good reason to do so, I'll just pick (a specific portion of) ISO 8601 and call it a day.