Re: Date format history - somewhere?
"sure, pedants will find exceptions"
I don't think I've seen one that adopted that. Things were generally spelled out, often using regnal years - in fact the realms covered by the regnal years still included France well into the C17th.
Here's a Derbyshire lease: "the twelfth day of September in the fourth year of the reign of our Sovereign Lord James ye second by the grace of God England Scotland France & Ireland King defender of the faith &c Annoq Dom one thousand six hundred eighty eight "
That one was on the cusp of replacing regnal years by AD years. A few decades later and into the C18th this is the somewhat terse date of my 6x great grandfather's Will: "the twenty first day of October Anno Dmi 1720".
By the time of my 5x great grandfather's Will this had got abit more wordy: "dated this twentythird Day of November in the Year of our Lord one Thousand seven Hundred forty and nine".
That continued into the C19th with my 3x ggfather: "the twenty seventh day of July in the year of our Lord one thousand eight hundred and fourteen".