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CAL(1) General Commands Manual CAL(1)

cal - print calendar

cal [ month ] year

Cal prints a calendar for the specified year. If a month is also specified, a calendar just for that month is printed. 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.

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.

UNIX-7