it is worse than "per country",

alaska changed when the u.s.

bought it from russia.

On Mon, Jul 15, 2024 at 10:45 AM Greg A. Woods <woods@robohack.ca> wrote:

At Sun, 14 Jul 2024 17:15:53 -0400, Marc Donner <marc.donner@gmail.com> wrote:
Subject: [TUHS] Re: When did "man cal" lose the comment about 1752?
>
> My instance of cal (MacOS 14.5) has this in the man page:
>
>      -s country_code
>
>              Assume the switch from Julian to Gregorian Calendar at the date
>              associated with the country_code.  If not specified, ncal tries
>              to guess the switch date from the local environment or falls back
>              to September 2, 1752.  This was when Great Britain and her
>              colonies switched to the Gregorian Calendar.

That's 'ncal' from FreeBSD, which is an entirely "new" implementation
written by Wolfgang Helbig:

        commit 0cb2e609d9c2f0ceaf730a57ac5c11580058e7f4
        Author: Wolfgang Helbig <helbig@FreeBSD.org>
        Date:   Mon Dec 15 20:35:22 1997 +0000

            Add new command ncal.

> Note that the switch to the Gregorian calendar happened at different times
> in different countries.  In Catholic-dominated countries it happened in
> October of 1582.  The English-speaking world, being Protestant-dominated,
> waited until September of 1752 to adopt it.

Indeed!

--
                                        Greg A. Woods <gwoods@acm.org>

Kelowna, BC     +1 250 762-7675           RoboHack <woods@robohack.ca>
Planix, Inc. <woods@planix.com>     Avoncote Farms <woods@avoncote.ca>