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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<appendix xml:id="datetime.constants" xmlns="http://docbook.org/ns/docbook">
&reftitle.constants;
<para>
The <constant>DATE_<replaceable>*</replaceable></constant>
constants are defined and offer standard
date representations, which can be used along with the date format functions
(like <function>date</function>).
</para>
<variablelist>
<title>
Available <parameter>returnFormat</parameter> for
<function>date_sunrise</function> and
<function>date_sunset</function>
</title>
<warning>
<simpara>
These constants are deprecated as of PHP 8.4.0.
The corresponding <function>date_sunrise</function> and
<function>date_sunset</function> functions are deprecated as of PHP 8.1.0.
</simpara>
</warning>
<varlistentry xml:id="constant.sunfuncs-ret-timestamp">
<term>
<constant>SUNFUNCS_RET_TIMESTAMP</constant>
(<type>int</type>)
</term>
<listitem>
<simpara>
Timestamp
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.sunfuncs-ret-string">
<term>
<constant>SUNFUNCS_RET_STRING</constant>
(<type>int</type>)
</term>
<listitem>
<simpara>
Hours:minutes (example: <literal>08:02</literal>)
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.sunfuncs-ret-double">
<term>
<constant>SUNFUNCS_RET_DOUBLE</constant>
(<type>int</type>)
</term>
<listitem>
<simpara>
Hours as floating point number (example <literal>8.75</literal>)
</simpara>
</listitem>
</varlistentry>
</variablelist>
<variablelist>
<title><constant>DATE_<replaceable>*</replaceable></constant> constants</title>
<varlistentry xml:id="constant.date-atom">
<term>
<constant>DATE_ATOM</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
Atom (example: <literal>2005-08-15T15:52:01+00:00</literal>)
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-cookie">
<term>
<constant>DATE_COOKIE</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
HTTP Cookies (example: <literal>Monday, 15-Aug-2005 15:52:01 UTC</literal>)
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-iso8601">
<term>
<constant>DATE_ISO8601</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
ISO-8601 (example: <literal>2005-08-15T15:52:01+0000</literal>)
</simpara>
<note>
<simpara>
This format is not compatible with ISO-8601, but is left this way for
backward compatibility reasons. Use
<constant>DATE_ISO8601_EXPANDED</constant>,
<constant>DATE_ATOM</constant> for compatibility with ISO-8601
instead (ref ISO8601:2004 section 4.3.3 clause d).
</simpara>
</note>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-iso8601-expanded">
<term>
<constant>DATE_ISO8601_EXPANDED</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
ISO-8601 Expanded (example: <literal>+10191-07-26T08:59:52+01:00</literal>)
</simpara>
<note>
<simpara>
This format allows for year ranges outside of ISO-8601's normal range
of <literal>0000</literal>-<literal>9999</literal> by always
including a sign character. It also addresses that that timezone part
(<literal>+01:00</literal>) is compatible with ISO-8601.
</simpara>
</note>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-rfc822">
<term>
<constant>DATE_RFC822</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 822 (example: <literal>Mon, 15 Aug 05 15:52:01 +0000</literal>)
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-rfc850">
<term>
<constant>DATE_RFC850</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 850 (example: <literal>Monday, 15-Aug-05 15:52:01 UTC</literal>)
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-rfc1036">
<term>
<constant>DATE_RFC1036</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 1036 (example: <literal>Mon, 15 Aug 05 15:52:01 +0000</literal>)
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-rfc1123">
<term>
<constant>DATE_RFC1123</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 1123 (example: <literal>Mon, 15 Aug 2005 15:52:01 +0000</literal>)
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-rfc7231">
<term>
<constant>DATE_RFC7231</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 7231 (as of PHP 7.0.19 and 7.1.5)
(example: <literal>Sat, 30 Apr 2016 17:52:13 GMT</literal>)
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-rfc2822">
<term>
<constant>DATE_RFC2822</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 2822 (example: <literal>Mon, 15 Aug 2005 15:52:01 +0000</literal>)
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-rfc3339">
<term>
<constant>DATE_RFC3339</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
Same as <constant>DATE_ATOM</constant>.
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-rfc3339-extended">
<term>
<constant>DATE_RFC3339_EXTENDED</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 3339 EXTENDED format
(example: <literal>2005-08-15T15:52:01.000+00:00</literal>)
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-rss">
<term>
<constant>DATE_RSS</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RSS (example: <literal>Mon, 15 Aug 2005 15:52:01 +0000</literal>).
&Alias; <constant>DATE_RFC1123</constant>.
</simpara>
</listitem>
</varlistentry>
<varlistentry xml:id="constant.date-w3c">
<term>
<constant>DATE_W3C</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
World Wide Web Consortium (example: <literal>2005-08-15T15:52:01+00:00</literal>).
&Alias; <constant>DATE_RFC3339</constant>.
</simpara>
</listitem>
</varlistentry>
</variablelist>
</appendix>
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