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Linux en Unix hebben een 'cal' kommando: kalender.
Dit is handig voor genealogen, op op te zoeken op welke dag in de week een bepaalde datum valt.
Vaak werd op zondagen afkondigingen gedaan voor het stadhuis van een huwelijk.

Voor 1810, voor het begin van het bevolkingsregister werd vaak op zondag getrouwd.
Een kalender is ook een handig hulpmiddel als de tekst op een akte moeilijk te lezen is.

Indien men thuis met windows werkt, kan men van de server van de provider ( bv: xs4all ) gebruik maken!
(n.b.: men heeft natuurlijk wel een account bij xs4all nodig!)

voorbeeld kalender 1900:

knop putty xs3.xs4all.nl - PuTTY
leeuwef@xs3:~% cal 1900
                             1900

      January               February               March
Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa
    1  2  3  4  5  6               1  2  3               1  2  3
 7  8  9 10 11 12 13   4  5  6  7  8  9 10   4  5  6  7  8  9 10
14 15 16 17 18 19 20  11 12 13 14 15 16 17  11 12 13 14 15 16 17
21 22 23 24 25 26 27  18 19 20 21 22 23 24  18 19 20 21 22 23 24
28 29 30 31           25 26 27 28           25 26 27 28 29 30 31

       April                  May                   June
Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa
 1  2  3  4  5  6  7         1  2  3  4  5                  1  2
 8  9 10 11 12 13 14   6  7  8  9 10 11 12   3  4  5  6  7  8  9
15 16 17 18 19 20 21  13 14 15 16 17 18 19  10 11 12 13 14 15 16
22 23 24 25 26 27 28  20 21 22 23 24 25 26  17 18 19 20 21 22 23
29 30                 27 28 29 30 31        24 25 26 27 28 29 30

        July                 August              September
Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa
 1  2  3  4  5  6  7            1  2  3  4                     1
 8  9 10 11 12 13 14   5  6  7  8  9 10 11   2  3  4  5  6  7  8
15 16 17 18 19 20 21  12 13 14 15 16 17 18   9 10 11 12 13 14 15
22 23 24 25 26 27 28  19 20 21 22 23 24 25  16 17 18 19 20 21 22
29 30 31              26 27 28 29 30 31     23 24 25 26 27 28 29
                                            30
      October               November              December
Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa  Su Mo Tu We Th Fr Sa
    1  2  3  4  5  6               1  2  3                     1
 7  8  9 10 11 12 13   4  5  6  7  8  9 10   2  3  4  5  6  7  8
14 15 16 17 18 19 20  11 12 13 14 15 16 17   9 10 11 12 13 14 15
21 22 23 24 25 26 27  18 19 20 21 22 23 24  16 17 18 19 20 21 22
28 29 30 31           25 26 27 28 29 30     23 24 25 26 27 28 29
                                            30 31

Met alleen cal krijg je de huidige maand: juni 2009

knop putty xs3.xs4all.nl - PuTTY
leeuwef@xs3:~% cal
     June 2009
Su Mo Tu We Th Fr Sa
    1  2  3  4  5  6
 7  8  9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30

Met het 'man cal' kommando krijg de de opties (manual pagina's gb )

knop putty xs3.xs4all.nl - PuTTY
leeuwef@xs3:~% man cal
CAL(1)                  FreeBSD General Commands Manual                 CAL(1)

NAME
     cal, ncal -- displays a calendar and the date of easter

SYNOPSIS
     cal [-jy] [[month] year]
     ncal [-jJpwy] [-s country_code] [[month] year]
     ncal [-Jeo] [year]

DESCRIPTION
     The cal utility displays a simple calendar in traditional format and ncal
     offers an alternative layout, more options and the date of easter.  The
     new format is a little cramped but it makes a year fit on a 25x80 termi-
     nal.  If arguments are not specified, the current month is displayed.

     The options are as follows:

     -J      Display Julian Calendar, if combined with the -e option, display
             date of easter according to the Julian Calendar.

     -e      Display date of easter (for western churches).

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

     -o      Display date of orthodox easter (Greek and Russian Orthodox
             Churches).

     -p      Print the country codes and switching days from Julian to Grego-
             rian Calendar as they are assumed by ncal.  The country code as
             determined from the local environment is marked with an asterisk.

     -s country_code
             Assume the switch from Julian to Gregorian Calendar at the date
             associated with the country_code.  If not specified, ncal tries
             to guess the switch date from the local environment or falls back
             to September 2, 1752. This was when Great Britain and her
             colonies switched to the Gregorian Calendar.
     
     -w      Print the number of the week below each week column.

     -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 and year; the month is either
     a number between 1 and 12, or a full or abbreviated name as specified by
     the current locale.

     A year starts on Jan 1.

SEE ALSO
     calendar(3), strftime(3)

HISTORY
     A cal command appeared in Version 5 AT&T UNIX.  The ncal command appeared
     in FreeBSD 2.2.6.

AUTHORS
     The ncal command and manual were written by Wolfgang Helbig
     <helbig&FreeBSD.org>.

BUGS
     The assignment of Julian - Gregorian switching dates to country codes is
     historically naive for many countries.

FreeBSD 4.10                   December 16, 1997                  FreeBSD 4.10

Zie ook wikipedia: cal commando ( gb )

Zie ook wikipedia:
Juliaanse kalender
Gregoriaanse kalender

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