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# VIII. Calendar Functions

# 介紹

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.

# 安裝

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

Windows 版本的 PHP 已內建此延伸的支援﹐所以你毋須再載入附加的延伸來使用這些功能。

# 執行時期組態

`php.ini`中沒有定義此延伸的組態指令。

# 資源類型

這個延伸沒有定義任何資源。

# 預先定義常數

以下的常數由此延伸定義，只在這個延伸被編譯成PHP或實行時期被動態載入時有效。

`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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