From: Jonathan de Boyne Pollard on
>
>>
>> It was not used only in Europe, but (at least) in all the various
>> European colonies.
>>
>>> The standard "cal" utility performed the switch between Julian and
>>> Gregorian calendar in september 1752 (see cal 9 1752) which
>>> corresponds to the date used in England.
>>>
>> in Britain and colonies
>>
>>> The Gregorian calendar (created by Pope Gregory III) was first used
>>> in 1582 in many other countries.
>>>
>> Gregory XIII. Clavius et al. created it; the Pope wanted and decreed it.
>>
>> Not *many* in 1582.
>>
> You are correct that this is incredibly naive of the cal(1) software
> tool. 25 countries and provinces have adopted the Gregorian calendar
> on 18 different dates, ranging from the year 1582 to as late as 1949.
>
If only either you or M. Stockton had been reading the past week's
discussion in the hereinmentioned newsgroups (under the hereinmentioned
subject). You'd have learned that various versions of cal are far from
naive about this, sporting as they do various relevant options,
including the -R option in the NetBSD cal command and the -s option in
the BSD ncal command. (-: