This is a ten-day difference though, which isn't really explained by leap year calculation differences/ Also, while it was never really formalised, the Paris C

This is a ten-day difference though, which isn't really explained by leap year calculation differences/ Also, while it was never really formalised, the Paris Commune in 1871 (year LXXIX) actually confirmed in an indirect way the Romme method of calculating leap years (every four years, except every 100 years, except every 400 years) by shortly using the Republican calendar. I have a hard time understanding this language though https://opensource.apple.com/source/emacs/emacs-54/emacs/lisp/calendar/cal-french.el.auto.html https://opensource.apple.com/source/emacs/emacs-54/emacs/lis... so I'm not sure where it goes wrong (or right).