>So I do what I can. I don't even ask what time format something belongs in. I just write ISO8601 by default. If someone complains then I point them to the inte

>So I do what I can. I don't even ask what time format something belongs in. I just write ISO8601 by default. If someone complains then I point them to the international standard and ask whether we want to be an internationally standards-compliant company. This is my approach as well. I've never gotten a complaint about it, which proves to me that the format is understandable AND unambiguous.