NAME
   cal - displays a calendar

SYNOPSIS
   cal [-smjy13] [[month] year]

DESCRIPTION
   Cal displays a simple calendar. If arguments are not specified, the cur-
   rent month is displayed. The options are as follows:

   -1    Display single month output. (This is the default.)

   -3    Display prev/current/next month output.

   -s    Display Sunday as the first day of the week. (This is the
    default.)

   -m    Display Monday as the first day of the week.

   -j    Display Julian dates (days one-based, numbered from January 1).

   -y    Display a calendar for the current year.

   A single parameter specifies the year (1 - 9999) to be displayed; note
   the year must be fully specified: ``cal 89'' will not display a calendar
   for 1989. Two parameters denote the month (1 - 12) and year. If no
   parameters are specified, the current month's calendar is displayed.

   A year starts on Jan 1.

   The Gregorian Reformation is assumed to have occurred in 1752 on the 3rd
   of September. By this time, most countries had recognized the reforma-
   tion (although a few did not recognize it until the early 1900's.)  Ten
   days following that date were eliminated by the reformation, so the cal-
   endar for that month is a bit unusual.

HISTORY
   A cal command appeared in Version 6 AT&T UNIX.

OTHER VERSIONS
   Several much more elaborate versions of this program exist, with support
   for colors, holidays, birthdays, reminders and appointments, etc. For
   example, try the cal from http://home.sprynet.com/~cbagwell/projects.html
   or GNU gcal.