bug#43677: 27.1; Calc holidays off-by-one error, incorrect business day calculation

[Lars Ingebrigtsen]

Mattias Engdegård <mattiase@acm.org> writes:

> Since the bug is a regression -- it is present in Emacs 26.1 but not
> in 22.1.1 -- it may be a good idea to find out exactly what change
> introduced it, and work from there. That might reduce the risk of
> causing secondary bugs.

That's quite a stretch to be bisecting, though...  What's the best test
function here?

(require 'calc-forms)
(math-from-business-day 526951)
=> (date 737732)

while it should be 737731?

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   bloggy blog: http://lars.ingebrigtsen.no