The Day for any Date
(in Bosbury, England)

Out of interest the shortest month ever in England was in 1752
(when the calendar changed from Julian to Gregorian)

Various online day-for-date calculators use the Gregorian calendar only so they are wrong for days before September 1752 when the Julian calendar applied. Also some miss the fact that every century up to 1700 was a leap year in the Julian Calendar (although later Gregorian rules would have made it not so).

Concerning the leap year extra day, a Statute of Henry III in 1256 said that “that Day, and the Day next going before, shall be accounted for one Day.” In other words the day was legally ignored and ‘leapt over’, hence the term ‘leap year’. This law applied until the nineteenth century.