More than once when booking holidays I have become alarmed when the date format was different and thought I had made a grave error.
If the US doesn't want to fall into step with the rest of the world it could at least use YYYY MM DD, which is used in some parts of the world. There is no confusion here because as soon as you see the year first, you known that is followed by the month and date.
One tweeter said it is map of countries using the right date format. A follow up tongue in cheek reply was, Can't believe how the world could be so wrong and so stubborn about it.
As another wit in the Twitter thread said, it also is comprehensive map of countries that put a man on the moon.
Another said it is a comprehensive map of countries that use zip codes, rather than postal codes.
I'll save the other pillory the US map for another day. You might guess what it is about though. Sorry you US people, I know you can't individually change what you are very used to.
Later: I have since learnt that it is terrible mess in Canada, with both formats being used. I am sure a Canadian will explain.