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[CathyA]

Originally Posted by Quoth

... What date format is expiry on a USA Credit card?...

MM/YY - All cards expire on the last day of the month, so day is not included; and the month number is always two digits with a leading 0 if less than 10.

[issybird]

Originally Posted by Quoth

England and Sweden (and places ruled by them) were two last users of the Julian Calendar: In the British Empire (including the American colonies), Wednesday 2 September 1752 was followed by Thursday 14 September 1752. For 12 years Sweden used a modified Julian calendar and adopted the Gregorian calendar in 1753.

Well, there’s Russia, of course, where most of the country switched over on January 31, 1918; the following day was February 14. That’s why the October Revolution was actually in November, according to the ROW. The Russian Orthodox Church still uses the Julian calendar.

[salamanderjuice]

Originally Posted by Quoth

Only the USA in the Entire World uses mm-dd-yy or mm-dd-yyyy. Spelling the month doesn't work. What date format is expiry on a USA Credit card?

All of the rest of the world uses dd-mm-yy, or yyyy, but the ISO is yyyy-mm-dd which sorts properly and is the same ordering as every other non-decimal quantity, such as tons stones pounds ounces. Or hours minutes seconds.

Even most countries without roman-latin alphabets now use arabic-indian digits, so the ISO numeric format OR the non USA numeric format works, May doesn't work.

Though if all Gregorian dates had 10,000 added to be Holocene Era, then we would have no AD / BC issues and maybe Moslems, Chinese and Jews wouldn't feel a western version of a Christian Calendar was being foisted on them. There also the problem of English History. England was one of the last places to change from the Julian to Gregorian.
The Julian calendar, proposed by Julius Caesar, took effect in 45 BC and lasted till 1582 when Pope Gregory authorised the current system. John Dee advised Queen Elizabeth I to adopt it but her privy council thought it too Papish.
England and Sweden (and places ruled by them) were two last users of the Julian Calendar: In the British Empire (including the American colonies), Wednesday 2 September 1752 was followed by Thursday 14 September 1752. For 12 years Sweden used a modified Julian calendar and adopted the Gregorian calendar in 1753.

Use the ISO format. No confusion anywhere.

Stop confusing Europe for the rest of the world. Japan/China use yyyy-mm-dd. Even better they use single characters for year (年), month (月) and day (日) so there's zero ambiguity (e.g. 2021年９月24日) and only slightly more to type. South America uses dd-mm-yyyy. dd-mm-yyyy is almost as bad as mm-dd-yyyy. I should know. Here in Canada all 3 are acceptable.