NAME

cal − print calendar

SYNOPSIS

cal [ month ] [ year ]

DESCRIPTION

Cal prints a calendar.  Month is either a number from 1 to 12, a lower case month name, or a lower case three-letter prefix of a month name.  Year can be between 1 and 9999.  If either month or year is omitted, the current month or year is used.  If only one argument is given, and it is a number larger than 12, a calendar for all twelve months of the given year is produced; otherwise a calendar for just one month is printed.  The calendar produced is that for England and her colonies. 

Try cal sep 1752

SOURCE

/appl/cmd/cal.b

BUGS

The year is always considered to start in January even though this is historically naive. 
Beware that refers to the early Christian era, not the 20th century.