cal - print calendar
] [ year
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.
can be between 1 and 9999. If either month
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.
cal sep 1752
The year is always considered to start in January even though this is
Beware that refers to the early Christian era, not the 20th century.