Source of: /manual/en/datetime.constants.php
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<div>
<h1>Predefined Constants</h1>
<p class="para">
The <a href="class.datetime.php#datetime.constants.types" class="link"><i>DATE_</i>
constants</a> 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.php" class="function">date()</a>).
</p>
<p class="para">
Following constants exists since PHP 5.1.2 and specify a format returned by
functions <a href="function.date-sunrise.php" class="function">date_sunrise()</a> and
<a href="function.date-sunset.php" class="function">date_sunset()</a>.
</p>
<dl>
<dt class="varlistentry">
<span class="term">
<b><tt class="constant">SUNFUNCS_RET_TIMESTAMP</tt></b>
(<a href="language.types.integer.php" class="type integer">integer</a>)
</span>
</dt><dd class="listitem">
<span class="simpara">
Timestamp
</span>
</dd>
<dt class="varlistentry">
<span class="term">
<b><tt class="constant">SUNFUNCS_RET_STRING</tt></b>
(<a href="language.types.integer.php" class="type integer">integer</a>)
</span>
</dt><dd class="listitem">
<span class="simpara">
Hours:minutes (example: 08:02)
</span>
</dd>
<dt class="varlistentry">
<span class="term">
<b><tt class="constant">SUNFUNCS_RET_DOUBLE</tt></b>
(<a href="language.types.integer.php" class="type integer">integer</a>)
</span>
</dt><dd class="listitem">
<span class="simpara">
Hours as floating point number (example 8.75)
</span>
</dd>
</dl>
</div>
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