Interresting quirk in cal? (1752)

[Henry Spencer]

> Someone just pointed this out to me, look at the month of September
> on this calander produced by "cal" for 1752 on a 3B2/400 SVR2: ...

This is correct behavior and a correct calendar, which is why the manual
page (at least, the older version of it) calls attention to that month.
In September 1752, England and its colonies converted to the Gregorian
calendar.  An adjustment was required to bring them into step with the
Catholic nations, which had converted rather earlier.
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