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<?xml version='1.0' encoding='iso-8859-1'?>
<!-- $Revision: 1.12 $ -->
<appendix xml:id="datetime.constants" xmlns="http://docbook.org/ns/docbook">
&reftitle.constants;
<para>
The following constants are defined since PHP 5.1.1 and they offer standard
date representations, which can be used along with the date format functions
(like <function>date</function>).
</para>
<variablelist>
<varlistentry>
<term>
<constant>DATE_ATOM</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
Atom (example: 2005-08-15T15:52:01+00:00)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>DATE_COOKIE</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
HTTP Cookies (example: Monday, 15-Aug-05 15:52:01 UTC)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>DATE_ISO8601</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
ISO-8601 (example: 2005-08-15T15:52:01+0000)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>DATE_RFC822</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 822 (example: Mon, 15 Aug 05 15:52:01 +0000)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>DATE_RFC850</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 850 (example: Monday, 15-Aug-05 15:52:01 UTC)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>DATE_RFC1036</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 1036 (example: Mon, 15 Aug 05 15:52:01 +0000)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>DATE_RFC1123</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 1123 (example: Mon, 15 Aug 2005 15:52:01 +0000)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>DATE_RFC2822</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RFC 2822 (Mon, 15 Aug 2005 15:52:01 +0000)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>DATE_RFC3339</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
Same as <constant>DATE_ATOM</constant> (since PHP 5.1.3)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>DATE_RSS</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
RSS (Mon, 15 Aug 2005 15:52:01 +0000)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>DATE_W3C</constant>
(<type>string</type>)
</term>
<listitem>
<simpara>
World Wide Web Consortium (example: 2005-08-15T15:52:01+00:00)
</simpara>
</listitem>
</varlistentry>
</variablelist>
<para>
Following constants exists since PHP 5.1.2 and specify a format returned by
functions <function>date_sunrise</function> and
<function>date_sunset</function>.
</para>
<variablelist>
<varlistentry>
<term>
<constant>SUNFUNCS_RET_TIMESTAMP</constant>
(<type>integer</type>)
</term>
<listitem>
<simpara>
Timestamp
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>SUNFUNCS_RET_STRING</constant>
(<type>integer</type>)
</term>
<listitem>
<simpara>
Hours:minutes (example: 08:02)
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term>
<constant>SUNFUNCS_RET_DOUBLE</constant>
(<type>integer</type>)
</term>
<listitem>
<simpara>
Hours as floating point number (example 8.75)
</simpara>
</listitem>
</varlistentry>
</variablelist>
</appendix>
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