I like YYYY-MM-DD because then I don't have to figure out half the time if they used MM-DD-YYYY or if they were sane.

If I want to know today's date ISO 8601 isn't a good answer

Can be tailed to the relevant bit though.

I became an evangelist for YYYY-MM-DD format once I had to deal with a legal battle that had multiple years of documentary evidence. I sorely regretted my choice of naming files when I had to wade through a heckton of upsetting reminders. It got a lot easier when I renamed everything according to YYYY-MM-DD (and the lawyers probably appreciated it too)

The one you grew up with tends to be your preference. But the usual reason I give for MM-DD-YYYY is it matches how it's said.

December 25th, 2026

12-25-2026

I also know there's no point in arguing about this because, again, my first sentence. It's just team sports stuff, as usual. The only reason why you would bother to argue is if you were trying to convince people to use a standard. But as you pointed out, ISO 8601 already exists. That is the agreed upon standard already. But no one uses it, since we have our preferred systems of date format already ingrained.

I agree, if you truncate YYYY-MM-DD you can only shorten it to showing the year and month. Besides, if I ask someone the date and they start from the year I'll just pull my phone out.