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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <title>Predefined Constants</title>  <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="datetime.resources.html">Resource Types</a></div> <div class="next" style="text-align: right; float: right;"><a href="timezones.html">List of Supported Timezones</a></div> <div class="up"><a href="book.datetime.html">Date/Time</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div> <h1>Predefined Constants</h1> <p class="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 <a href="function.date.html" class="function">date()</a>). </p> <dl>  <dt>   <span class="term">    <b><tt>DATE_ATOM</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     Atom (example: 2005-08-15T15:52:01+00:00)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>DATE_COOKIE</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     HTTP Cookies (example: Monday, 15-Aug-05 15:52:01 UTC)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>DATE_ISO8601</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     ISO-8601 (example: 2005-08-15T15:52:01+0000)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>DATE_RFC822</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     RFC 822 (example: Mon, 15 Aug 05 15:52:01 +0000)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>DATE_RFC850</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     RFC 850 (example: Monday, 15-Aug-05 15:52:01 UTC)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>DATE_RFC1036</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     RFC 1036 (example: Mon, 15 Aug 05 15:52:01 +0000)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>DATE_RFC1123</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     RFC 1123 (example: Mon, 15 Aug 2005 15:52:01 +0000)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>DATE_RFC2822</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     RFC 2822 (Mon, 15 Aug 2005 15:52:01 +0000)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>DATE_RFC3339</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     Same as <b><tt>DATE_ATOM</tt></b> (since PHP 5.1.3)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>DATE_RSS</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     RSS (Mon, 15 Aug 2005 15:52:01 +0000)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>DATE_W3C</tt></b>     (<a href="language.types.string.html" class="type string">string</a>)   </span>   <dd>    <span class="simpara">     World Wide Web Consortium (example: 2005-08-15T15:52:01+00:00)    </span>   </dd>  </dt> </dl> <p class="para">  Following constants exists since PHP 5.1.2 and specify a format returned by  functions <a href="function.date-sunrise.html" class="function">date_sunrise()</a> and  <a href="function.date-sunset.html" class="function">date_sunset()</a>. </p> <dl>  <dt>   <span class="term">    <b><tt>SUNFUNCS_RET_TIMESTAMP</tt></b>     (<a href="language.types.integer.html" class="type integer">integer</a>)   </span>   <dd>    <span class="simpara">     Timestamp    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>SUNFUNCS_RET_STRING</tt></b>     (<a href="language.types.integer.html" class="type integer">integer</a>)   </span>   <dd>    <span class="simpara">     Hours:minutes (example: 08:02)    </span>   </dd>  </dt>  <dt>   <span class="term">    <b><tt>SUNFUNCS_RET_DOUBLE</tt></b>     (<a href="language.types.integer.html" class="type integer">integer</a>)   </span>   <dd>    <span class="simpara">     Hours as floating point number (example 8.75)    </span>   </dd>  </dt> </dl></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; 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