NetBSD/usr.bin/cal/cal.1

.\"	$NetBSD: cal.1,v 1.13 2002/10/25 20:10:21 wiz Exp $
.\"
.\" Copyright (c) 1989, 1990, 1993
.\"	The Regents of the University of California.  All rights reserved.
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.\" This code is derived from software contributed to Berkeley by
.\" Kim Letkeman.
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.\"     @(#)cal.1	8.2 (Berkeley) 4/28/95
.\"
.Dd October 25, 2002
.Dt CAL 1
.Os
.Sh NAME
.Nm cal
.Nd displays a calendar
.Sh SYNOPSIS
.Nm
.Op Fl jy3
.Op Fl A after
.Op Fl B before
.Op Oo Ar month Oc Ar \ year
.Sh DESCRIPTION
.Nm
displays a simple calendar.
If arguments are not specified,
the current month is displayed.
The options are as follows:
.Bl -tag -width Ds
.It Fl A Ar after
Display
.Ar after
months after the specified month.
.It Fl B Ar before
Display
.Ar before
months before the specified month.
.It Fl j
Display Julian dates (days one-based, numbered from January 1).
.It Fl y
Display a calendar for the current year.
.It Fl 3
Same as
.Dq Fl A Ar 1 Fl B Ar 1 .
.El
.Pp
A single parameter specifies the year (1 - 9999) to be displayed;
note the year must be fully specified:
.Dq Li cal 89
will
.Em 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
In the USA and Great Britain the Gregorian Reformation occurred in 1752.
By this time, most countries had recognized the reformation (although a
few did not recognize it until the early 1900's.)
Eleven days following September 2, 1752 were eliminated by the reformation,
so the calendar for that month is a bit unusual.
.Sh NOTES
In view of the chaotic way the Gregorian calendar was adopted throughout
the world in the years between 1582 and 1923 make sure to take into account
the date of the Gregorian Reformation in your region if you are checking a
calendar for a very old date.
.Sh HISTORY
A
.Nm
command appeared in
.At v6 .