php-doc-en/reference/datetime/constants.xml

<?xml version='1.0' encoding='iso-8859-1'?>
<!-- $Revision: 1.8 $ -->
<section id="datetime.constants">
 &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_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>
</section>

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