The mapping from year, month, day that I use (based on the Wikipedia page, but starting on march 1, 1600) doesn't take that gap into account. So the days in tha

The mapping from year, month, day that I use (based on the Wikipedia page, but starting on march 1, 1600) doesn't take that gap into account. So the days in that gap exist for me, but we don't deal with dates that far back.