8d67a1ce88
Britain and its colonies eliminated 11 days (not 10), following
September 2, 1752.
From "A.D. 1751. Anno vicesimo quarto GEORGII II. CAP. XXIII.
An Act for Regulating the Commencement of the Year; and for
Correcting the Calendar now in Use.":
"... and that the natural Day next immediately following the said 2nd Day of
*September* [1752], shall be called, reckoned and accounted to be the 14th
Day of *September*, omitting for that Time only the 11 intermediate nominal
Days of the common Calendar;
and that the several natural Days, which shall follow and succeed next after
the said 14th Day of *September*, shall be respectively called, reckoned and
numbered forwards in numerical Order from the said 14th Day of *September*,
according to the Order and Succession of Days now used in the present
Calendar; "
Added a caution note on using cal for very old dates.
Problem mentionned in PR 5215 by John Franklin (franklin@bev.net).
Thanks to Perry Metzger for his comments and for reviewing this man page.
89 lines
3.4 KiB
Groff
89 lines
3.4 KiB
Groff
.\" $NetBSD: cal.1,v 1.8 1999/11/03 14:32:25 wennmach 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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 April 28, 1995
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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 jy
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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 j
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Display julian dates (days one-based, numbered from January 1).
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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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A single parameter specifies the year (1 - 9999) to be displayed;
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note the year must be fully specified:
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.Dq Li cal 89
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will
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.Em not
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display a calendar for 1989.
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Two parameters denote the month (1 - 12) and year.
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If no parameters are specified, the current month's calendar is
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displayed.
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.Pp
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A year starts on Jan 1.
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.Pp
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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 early 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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.Sh NOTE
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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 1923 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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.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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