From: Dave Horsfall
What does "cal 9 1752" show on your boxes?
Given that the source:
https://minnie.tuhs.org//cgi-bin/utree.pl?file=V6/usr/source/s1/cal.c
has been in C since at least V6, I'd be rather surprised if on other
machines it did anything other than what those of us who were paying
attention read in the documentation:
https://minnie.tuhs.org//cgi-bin/utree.pl?file=V6/usr/man/man6/cal.6
back then: "Try September 1752."
Get off my lawn.
Noel
PS: Said documentation already notes that it won't work in most counries:
"The calendar produced is that for England and her colonies." For more
fun with calendates, check out the Japanese Lunar-Solar Calendar:
http://www.chiappa.net/~jnc/prints/calendar.html