usr/src/usr.bin/cal/cal.1

.\" Copyright (c) 1989 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Kim Letkeman.
.\"
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.\" provided that the above copyright notice and this paragraph are
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.\"     @(#)cal.1       6.3 (Berkeley) %G%
.\"
.TH CAL 1 ""
.UC 7
.SH NAME
cal \- displays a calendar
.SH SYNOPSIS
.B cal
[
[
.I month
]
.I year
]
.SH DESCRIPTION
.I Cal
displays a calendar for a specified month and/or year.
A single parameter specifies the year (1 - 9999) to be displayed;
note the year must be fully specified: ``cal 89'' will
.B 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.
.PP
A year starts on Jan 1.
.PP
The Gregorian Reformation is assumed to have occurred on 3 September
1752.
By this time, most countries had recognized the reformation (although
a few did not recognize it until the early 1900's.)
From 3 September 1752 through 13 September 1752 was eliminated by
the reformation, so the calendar for that month is a bit unusual.