I wonder how many libraries correctly handles the date 1712-02-30 in the Swedish calendar (according to Wikipedia the only official 30th of February in history)?
Tried using ncal like in the examples in that blog post, but it did not work correctly using either Julian or Gregorian. Of course the Swedish calendar from 1700-1712 was neither, but somewhere in-between, because of the (failed) attempt to gradually move from one to the other.
https://en.wikipedia.org/wiki/List_of_non-standard_dates#Feb...
Tried using ncal like in the examples in that blog post, but it did not work correctly using either Julian or Gregorian. Of course the Swedish calendar from 1700-1712 was neither, but somewhere in-between, because of the (failed) attempt to gradually move from one to the other.