Calendar 函数
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easter_date

(PHP 4, PHP 5)

easter_dateGet Unix timestamp for midnight on Easter of a given year

说明

int easter_date ([ int $year ] )

Returns the Unix timestamp corresponding to midnight on Easter of the given year.

Warning

This function will generate a warning if the year is outside of the range for Unix timestamps (i.e. before 1970 or after 2037).

The date of Easter Day was defined by the Council of Nicaea in AD325 as the Sunday after the first full moon which falls on or after the Spring Equinox. The Equinox is assumed to always fall on 21st March, so the calculation reduces to determining the date of the full moon and the date of the following Sunday. The algorithm used here was introduced around the year 532 by Dionysius Exiguus. Under the Julian Calendar (for years before 1753) a simple 19-year cycle is used to track the phases of the Moon. Under the Gregorian Calendar (for years after 1753 - devised by Clavius and Lilius, and introduced by Pope Gregory XIII in October 1582, and into Britain and its then colonies in September 1752) two correction factors are added to make the cycle more accurate.

(The code is based on a C program by Simon Kershaw, <webmaster at ely.anglican dot org>)

参数

year

The year as a number between 1970 an 2037

返回值

The easter date as a unix timestamp.

更新日志

版本 说明
Since 4.3.0 The year parameter is optional and defaults to the current year according to the local time if omitted.

范例

Example #1 easter_date() example

<?php

echo date("M-d-Y"easter_date(1999));        // Apr-04-1999
echo date("M-d-Y"easter_date(2000));        // Apr-23-2000
echo date("M-d-Y"easter_date(2001));        // Apr-15-2001

?>

参见


Calendar 函数
php 手册 | 脚本学堂 | 脚本编程 | 网站编程 | 系统管理 | 服务器配置 | 数据库管理 | Php教程 | python教程 | 正则表达式 | 批处理脚本 | Centos教程 | Linux基础教程