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

<?xml version="1.0" encoding="utf-8"?>
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<appendix xml:id="datetime.constants" xmlns="http://docbook.org/ns/docbook">
 &reftitle.constants;
 <para>
  The <link linkend="datetime.constants.types"><literal>DATE_</literal>
  constants</link> are defined and they offer standard
  date representations, which can be used along with the date format functions
  (like <function>date</function>).
 </para>
 <para>
  Following constants specify a format returned by
  functions <function>date_sunrise</function> and
  <function>date_sunset</function>.
 </para>
 <variablelist>
  <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: 08:02)
    </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 8.75)
    </simpara>
   </listitem>
  </varlistentry>
 </variablelist>
</appendix>

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