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# VIII. Calendar Functions

# Introduktion

The calendar extension presents a series of functions to simplify converting between different calendar formats. The intermediary or standard it is based on is the Julian Day Count. The Julian Day Count is a count of days starting from January 1st, 4713 B.C. To convert between calendar systems, you must first convert to Julian Day Count, then to the calendar system of your choice. Julian Day Count is very different from the Julian Calendar! For more information on Julian Day Count, visit http://www.hermetic.ch/cal_stud/jdn.htm. For more information on calendar systems visit http://www.boogle.com/info/cal-overview.html. Excerpts from this page are included in these instructions, and are in quotes.

# Installation

To get these functions to work, you have to compile PHP with --enable-calendar.

Windows versionen af PHP har indbygget support for denne udvidelse. Du behøver ikke indsætte ekstra udvidelser for at bruge disse funktioner.

# Runtime Konfiguration

Denne udvidelse har intet konfigurations-direktiv defineret i `php.ini`.

# Ressourcetyper

Denne udvidelse har ingen ressourcetyper defineret.

# Foruddefinerede Konstanter

Konstanterne nedenunder er defineret af denne udvidelse, og vil kun være tilgængelige når denne udvidelse enten er blevet kompileret ind i PHP eller dynamisk indsat under runtime.

`CAL_GREGORIAN` (integer)

`CAL_JULIAN` (integer)

`CAL_JEWISH` (integer)

`CAL_FRENCH` (integer)

`CAL_NUM_CALS` (integer)

`CAL_DOW_DAYNO` (integer)

`CAL_DOW_SHORT` (integer)

`CAL_DOW_LONG` (integer)

`CAL_MONTH_GREGORIAN_SHORT` (integer)

`CAL_MONTH_GREGORIAN_LONG` (integer)

`CAL_MONTH_JULIAN_SHORT` (integer)

`CAL_MONTH_JULIAN_LONG` (integer)

`CAL_MONTH_JEWISH` (integer)

`CAL_MONTH_FRENCH` (integer)

The following constants are available since PHP 4.3.0 :

`CAL_EASTER_DEFAULT` (integer)

`CAL_EASTER_ROMAN` (integer)

`CAL_EASTER_ALWAYS_GREGORIAN` (integer)

`CAL_EASTER_ALWAYS_JULIAN` (integer)

The following constants are available since PHP 5.0.0 :

`CAL_JEWISH_ADD_ALAFIM_GERESH` (integer)

`CAL_JEWISH_ADD_ALAFIM` (integer)

`CAL_JEWISH_ADD_GERESHAYIM` (integer)

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