CAL(1) General Commands Manual CAL(1)
cal - displays a calendar
cal [-jmwy] [month] [year]
cal displays a simple calendar. Calendars may be displayed by month or
The options are as follows:
-j Display Julian dates (days one-based, numbered from January 1).
The options -j and -w are mutually exclusive.
-m Display weeks starting on Monday instead of Sunday.
-w Display week numbers in the month display. If -m is specified
the ISO week format is assumed. The options -j and -w are
-y Display a calendar for the current year.
A single numerical parameter specifies the year (1 - 9999) to be
displayed. The year must be fully specified: "cal 89" will not display a
calendar for 1989. Two parameters denote the month (1 - 12, or a month
name or abbreviation thereof) and year. Alternatively, a single
parameter may be given specifying the name or abbreviated name of a
month: in that case a calendar is displayed for that month of the current
year. If no parameters are specified, the current month's calendar is
A year starts on January 1st.
The Gregorian Reformation is assumed to have occurred in 1752 after the
2nd of September. By this time, most countries had recognized the
Reformation (although a few did not recognize it until the early 1900s).
Eleven days following that date were eliminated by the Reformation, so
the calendar for that month is a bit unusual.
The cal utility exits 0 on success, and >0 if an error occurs.
The cal utility is compliant with the X/Open System Interfaces option of
the IEEE Std 1003.1-2008 ("POSIX.1") specification.
The flags [-jmwy], as well as the ability to specify a month name as a
single argument, are extensions to that specification.
The week number computed by -mw is compliant with the ISO 8601
A cal command appeared in Version 1 AT&T UNIX.
OpenBSD 6.2 November 27, 2016 OpenBSD 6.2
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