PHP Calendar Introduction
PHP日历介绍

The calendar functions are useful when working with different calendar formats. The standard it is based on is the Julian day count (Julian day count is a count of days starting from January 1, 4713 B.C.). Note that the Julian day count is not the same as the Julian calendar!
日历扩展是由一系列简单的日历格式转换函数组成。媒介或标准是基于儒略日计数（Julian Day Count）。儒略日计数是从公元前 4713 年 1 月 1 日开始计算的。儒略日计数与罗马儒略历（Julian Calendar）完全不同！

Note: To convert between calendar formats, you must first convert to Julian day count, then to the calendar format.
注意：在不同的日历系统中转换，必须先将其转换为儒略日计数，然后转换为目标日历格式。

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Installation
安装

The windows version of PHP has built-in support for the calendar extension. So, the calendar functions will work automatically.
PHP 的 Windows 版本已经内置该扩展模块的支持。无需加载任何附加扩展库即可使用这些函数。

However, if you are running the Linux version of PHP, you will have to compile PHP with --enable-calendar to get the calendar functions to work.
但要在Linux版本的PHP中使用本类函数，需要在编译 PHP 时加上 --enable-calendar。

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PHP Calendar Functions
PHP日历函数

PHP: indicates the earliest version of PHP that supports the function.
PHP：最早支持这些函数的PHP版本

Function 函数	Description 说明	PHP
cal_days_in_month()	Returns the number of days in a month for a specified year and calendar 返回指定日历、年份的某个月份的天数	4
cal_from_jd()	Converts a Julian day count into a date of a specified calendar 将儒略[Julian]日计数转为其它日历的日期	4
cal_info()	Returns information about a given calendar 返回指定日历的信息	4
cal_to_jd()	Converts a date to Julian day count 将指定日期转为儒略日计数	4
easter_date()	Returns the Unix timestamp for midnight on Easter of a specified year 返回指定年份的复活节午夜的Unix时间戳	3
easter_days()	Returns the number of days after March 21, on which Easter falls for a specified year 返回指定年份的某一天超过3月21日复活节的天数	3
FrenchToJD()	Converts a French Republican date to a Julian day count 将法国共和历转为儒略日计数	3
GregorianToJD()	Converts a Gregorian date to a Julian day count 将格里高里历转为儒略日计数	3
JDDayOfWeek()	Returns the day of a week 返回一周中的天数	3
JDMonthName()	Returns a month name 返回月份的名字	3
JDToFrench()	Converts a Julian day count to a French Republican date 将儒略日计数转为法国共和历	3
JDToGregorian()	Converts a Julian day count to a Gregorian date 将儒略日计数转为格里高里历	3
jdtojewish()	Converts a Julian day count to a Jewish date 将儒略日计数转为犹太历	3
JDToJulian()	Converts a Julian day count to a Julian date 将儒略日计数转为罗马儒略历	3
jdtounix()	Converts a Julian day count to a Unix timestamp 将儒略日计数转为Unix时间戳	4
JewishToJD()	Converts a Jewish date to a Julian day count 将犹太历转为儒略日计数	3
JulianToJD()	Converts a Julian date to a Julian day count 将罗马儒略历转为儒略日计数	3
unixtojd()	Converts a Unix timestamp to a Julian day count 将Unix时间戳转为儒略日计数	4

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PHP Calendar Constants
PHP日历常量

PHP: indicates the earliest version of PHP that supports the constant.
PHP：下面列举了最早支持这些函数的PHP版本：

Constant 常量	Description 说明	PHP
CAL_GREGORIAN	Gregorian calendar 格里高里历	3
CAL_JULIAN	Julian calendar 罗马儒略历	3
CAL_JEWISH	Jewish calendar 犹太历	3
CAL_FRENCH	French Republican calendar 法国共和历	3
CAL_NUM_CALS		3
CAL_DOW_DAYNO		3
CAL_DOW_SHORT		3
CAL_DOW_LONG		3
CAL_MONTH_GREGORIAN_SHORT		3
CAL_MONTH_GREGORIAN_LONG		3
CAL_MONTH_JULIAN_SHORT		3
CAL_MONTH_JULIAN_LONG		3
CAL_MONTH_JEWISH		3
CAL_MONTH_FRENCH		3
CAL_EASTER_DEFAULT		4
CAL_EASTER_DEFAULT		4
CAL_EASTER_ROMAN		4
CAL_EASTER_ALWAYS_GREGORIAN		4
CAL_EASTER_ALWAYS_JULIAN		4
CAL_JEWISH_ADD_ALAFIM_GERESH		5
CAL_JEWISH_ADD_ALAFIM		5
CAL_JEWISH_ADD_GERESHAYIM		5

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