I just realized you may not know of all the different Gregorian calendar adoption dates: https://en.m.wikipedia.org/wiki/List_of_adoption_dates_of_the_Gregoria

I just realized you may not know of all the different Gregorian calendar adoption dates: https://en.m.wikipedia.org/wiki/List_of_adoption_dates_of_the_Gregorian_calendar_by_country https://en.m.wikipedia.org/wiki/List_of_adoption_dates_of_th...