Why does "cal 9 1752" produce incorrect results?

[Thad P Floryan]

khenry at umaxc.weeg.uiowa.edu (Ken Henry) in <3313 at ns-mx.uiowa.edu> writes:

	Does anybody know why "cal 9 1752" produce incorrect
	results?  It seems to be in the Unix systems I
	checked (BSD 4.3, AIX 3.1).  

The calendar was revised back then; read any recent WORLD ALMANAC or modern
encyclopedia for more background info.

Thad Floryan [ thad at cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]