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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@298915 c90b9560-bf6c-de11-be94-00142212c4b1
143 lines
3.7 KiB
XML
143 lines
3.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.easter-date" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>easter_date</refname>
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<refpurpose>Get Unix timestamp for midnight on Easter of a given year</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>int</type><methodname>easter_date</methodname>
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<methodparam choice="opt"><type>int</type><parameter>year</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns the Unix timestamp corresponding to midnight on Easter of
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the given year.
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</para>
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<warning>
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<para>
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This function will generate a warning if the year is outside
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of the range for Unix timestamps (i.e. before 1970 or after 2037).
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</para>
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</warning>
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<para>
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The date of Easter Day was defined by the Council of Nicaea in
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AD325 as the Sunday after the first full moon which falls on or
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after the Spring Equinox. The Equinox is assumed to always fall
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on 21st March, so the calculation reduces to determining the date
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of the full moon and the date of the following Sunday. The
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algorithm used here was introduced around the year 532 by
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Dionysius Exiguus. Under the Julian Calendar (for years before
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1753) a simple 19-year cycle is used to track the phases of the
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Moon. Under the Gregorian Calendar (for years after 1753 -
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devised by Clavius and Lilius, and introduced by Pope Gregory
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XIII in October 1582, and into Britain and its then colonies in
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September 1752) two correction factors are added to make the
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cycle more accurate.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>year</parameter></term>
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<listitem>
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<para>
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The year as a number between 1970 an 2037
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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The easter date as a unix timestamp.
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</para>
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>Since 4.3.0</entry>
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<entry>
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The <parameter>year</parameter> parameter is optional and defaults
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to the current year according to the local time if omitted.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>easter_date</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo date("M-d-Y", easter_date(1999)); // Apr-04-1999
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echo date("M-d-Y", easter_date(2000)); // Apr-23-2000
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echo date("M-d-Y", easter_date(2001)); // Apr-15-2001
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member>
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<function>easter_days</function> for calculating Easter
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before 1970 or after 2037
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</member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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