161 lines
5.5 KiB
Groff
161 lines
5.5 KiB
Groff
.\" $NetBSD: cal.1,v 1.20 2007/12/24 13:56:00 wiz Exp $
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.\"
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.\" Copyright (c) 1989, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Kim Letkeman.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)cal.1 8.2 (Berkeley) 4/28/95
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.\"
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.Dd December 21, 2007
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.Dt CAL 1
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.Os
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.Sh NAME
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.Nm cal
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.Nd displays a calendar
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.Sh SYNOPSIS
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.Nm
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.Op Fl 3hjry
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.Op Fl A Ar after
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.Op Fl B Ar before
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.Op Fl d Ar day-of-week
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.Op Fl R Ar reform-spec
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.Op Oo Ar month Oc Ar year
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.Sh DESCRIPTION
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.Nm
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displays a simple calendar.
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If arguments are not specified,
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the current month is displayed.
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl 3
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Same as
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.Dq Fl A Ar 1 Fl B Ar 1 .
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.It Fl A Ar after
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Display
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.Ar after
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months after the specified month.
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.It Fl B Ar before
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Display
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.Ar before
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months before the specified month.
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.It Fl d Ar day-of-week
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Specifies the day of the week on which the calendar should start.
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Valid values are 0 through 6, presenting Sunday through Saturday,
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inclusively.
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The default output starts on Sundays.
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.It Fl h
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Highlight the current day, if present in the displayed calendar.
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If output is to a terminal, then the appropriate terminal sequences
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are used, otherwise overstriking is used.
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If more than one
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.Fl h
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is used and output is to a terminal, the current date will be
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highlighted in inverse video instead of bold.
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.It Fl j
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Display Julian dates (days one-based, numbered from January 1).
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.It Fl R Ar reform-spec
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Selects an alternate Gregorian reform point from the default of
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September 3rd, 1752.
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The
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.Ar reform-spec
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can be selected by one of the built-in names (see
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.Sx NOTES
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for a list) or by a date of the form YYYY/MM/DD.
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The date and month may be omitted, provided that what is specified
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uniquely selects a given built-in reform point.
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If an exact date is specified, then that date is taken to be the first
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missing date of the Gregorian Reform to be applied.
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.It Fl r
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Display the month in which the Gregorian Reform adjustment was
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applied, if no other
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.Ar month
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or
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.Ar year
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information is given.
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If used in conjunction with
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.Fl y ,
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then the entire year is displayed.
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.It Fl y
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Display a calendar for the current year.
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.El
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.Pp
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If no parameters are specified, the current month's calendar is
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displayed.
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A single parameter specifies the year and optionally the month
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in ISO format:
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.Dq Li cal 2007-12
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Two parameters denote the month (1 - 12) and year.
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Note that the century must be included in the year.
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.Pp
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A year starts on Jan 1.
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.Sh NOTES
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In the USA and Great Britain the Gregorian Reformation occurred in 1752.
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By this time, most countries had recognized the reformation (although a
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few did not recognize it until the 1900's.)
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Eleven days following September 2, 1752 were eliminated by the reformation,
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so the calendar for that month is a bit unusual.
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.Pp
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In view of the chaotic way the Gregorian calendar was adopted throughout
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the world in the years between 1582 and 1928 make sure to take into account
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the date of the Gregorian Reformation in your region if you are checking a
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calendar for a very old date.
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.Pp
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.Nm
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has a decent built-in list of Gregorian Reform dates and the names of
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the countries where the reform was adopted:
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.Pp
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.Bd -literal
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Italy Oct. 5, 1582 Denmark Feb. 19, 1700
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Spain Oct. 5, 1582 Great Britain Sep. 3, 1752
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Portugal Oct. 5, 1582 Sweden Feb. 18, 1753
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Poland Oct. 5, 1582 Finland Feb. 18, 1753
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France Dec. 12, 1582 Japan Dec. 20, 1872
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Luxembourg Dec. 22, 1582 China Nov. 7, 1911
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Netherlands Dec. 22, 1582 Bulgaria Apr. 1, 1916
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Bavaria Oct. 6, 1583 U.S.S.R. Feb. 1, 1918
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Austria Jan. 7, 1584 Serbia Jan. 19, 1919
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Switzerland Jan. 12, 1584 Romania Jan. 19, 1919
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Hungary Oct. 22, 1587 Greece Mar. 10, 1924
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Germany Feb. 19, 1700 Turkey Dec. 19, 1925
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Norway Feb. 19, 1700 Egypt Sep. 18, 1928
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.Ed
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.Pp
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The country known as
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.Em Great Britain
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can also be referred to as
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.Em England
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since that has less letters and no spaces in it.
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This is meant only as a measure of expediency, not as a possible
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slight to anyone involved.
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v6 .
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