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PHP Calendar
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。
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。
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 |
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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