CAL(1) — Unix Programmer’s Manual
NAME
cal − print calendar
SYNOPSIS
cal [ month ] year
DESCRIPTION
Cal prints a calendar for the specified year. If you specify a month with the year, cal prints a calendar just for that month. Year can be between 1 and 9999. The month is a number between 1 and 12. The calendar produced is that for England and her colonies.
Try September 1752.
BUGS
The year is always considered to start in January even though this is historically naive.
Beware that ‘cal 78’ refers to the early Christian era, not the 20th century.
INTEGRATED SOLUTIONS 4.3 BSD — April 29, 1985