<?xml version="1.0" encoding="utf-8"?>
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 <title>The DateInterval class</title>
 <titleabbrev>DateInterval</titleabbrev>

 <partintro>

<!-- {{{ DateInterval intro -->
  <section xml:id="dateinterval.intro">
   &reftitle.intro;
   <para>
    Represents a date interval.
   </para>
   <para>
    A date interval stores either a fixed amount of time (in years, months,
    days, hours etc) or a relative time string in the format that
    <classname>DateTime</classname>'s constructor supports.
   </para>
  </section>
<!-- }}} -->

  <section xml:id="dateinterval.synopsis">
   &reftitle.classsynopsis;

<!-- {{{ Synopsis -->
   <classsynopsis>
    <ooclass><classname>DateInterval</classname></ooclass>

<!-- {{{ Class synopsis -->
    <classsynopsisinfo>
     <ooclass>
      <classname>DateInterval</classname>
     </ooclass>
    </classsynopsisinfo>
<!-- }}} -->

    <classsynopsisinfo role="comment">&Properties;</classsynopsisinfo>
    <fieldsynopsis>
     <modifier>public</modifier>
     <type>integer</type>
     <varname linkend="dateinterval.props.y">y</varname>
    </fieldsynopsis>
    <fieldsynopsis>
     <modifier>public</modifier>
     <type>integer</type>
     <varname linkend="dateinterval.props.m">m</varname>
    </fieldsynopsis>
    <fieldsynopsis>
     <modifier>public</modifier>
     <type>integer</type>
     <varname linkend="dateinterval.props.d">d</varname>
    </fieldsynopsis>
    <fieldsynopsis>
     <modifier>public</modifier>
     <type>integer</type>
     <varname linkend="dateinterval.props.h">h</varname>
    </fieldsynopsis>
    <fieldsynopsis>
     <modifier>public</modifier>
     <type>integer</type>
     <varname linkend="dateinterval.props.i">i</varname>
    </fieldsynopsis>
    <fieldsynopsis>
     <modifier>public</modifier>
     <type>integer</type>
     <varname linkend="dateinterval.props.s">s</varname>
    </fieldsynopsis>
    <fieldsynopsis>
     <modifier>public</modifier>
     <type>integer</type>
     <varname linkend="dateinterval.props.invert">invert</varname>
    </fieldsynopsis>
    <fieldsynopsis>
     <modifier>public</modifier>
     <type>mixed</type>
     <varname linkend="dateinterval.props.days">days</varname>
    </fieldsynopsis>
    
    <classsynopsisinfo role="comment">&Methods;</classsynopsisinfo>
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.dateinterval')/db:refentry/db:refsect1[@role='description']/descendant::db:constructorsynopsis[not(@role='procedural')])">
     <xi:fallback />
    </xi:include>
    <!--
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.dateinterval')/db:refentry/db:refsect1[@role='description']/descendant::db:destructorsynopsis[not(@role='procedural')])">
     <xi:fallback />
    </xi:include>
    -->
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.dateinterval')/db:refentry/db:refsect1[@role='description']/descendant::db:methodsynopsis[not(@role='procedural')])">
     <xi:fallback />
    </xi:include>

   </classsynopsis>
<!-- }}} -->

  </section>
  
  <section xml:id="dateinterval.props">
   &reftitle.properties;
   <variablelist>
    <varlistentry xml:id="dateinterval.props.y">
     <term><varname>y</varname></term>
     <listitem>
      <para>
       Number of years.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry xml:id="dateinterval.props.m">
     <term><varname>m</varname></term>
     <listitem>
      <para>
       Number of months.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry xml:id="dateinterval.props.d">
     <term><varname>d</varname></term>
     <listitem>
      <para>
       Number of days.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry xml:id="dateinterval.props.h">
     <term><varname>h</varname></term>
     <listitem>
      <para>
       Number of hours.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry xml:id="dateinterval.props.i">
     <term><varname>i</varname></term>
     <listitem>
      <para>
       Number of minutes.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry xml:id="dateinterval.props.s">
     <term><varname>s</varname></term>
     <listitem>
      <para>
       Number of seconds.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry xml:id="dateinterval.props.invert">
     <term><varname>invert</varname></term>
     <listitem>
      <para>
       Is <literal>1</literal> if the interval
       represents a negative time period and
       <literal>0</literal> otherwise.
       See <methodname>DateInterval::format</methodname>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry xml:id="dateinterval.props.days">
     <term><varname>days</varname></term>
     <listitem>
      <para>
       If the DateInterval object was created by
       <function>DateTime::diff</function>, then this is the total number of
       days between the start and end dates. Otherwise,
       <varname>days</varname> will be &false;.
      </para>
      <para>
       Before PHP 5.4.20/5.5.4 instead of &false; you will receive -99999 upon
       accessing the property.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </section>

 </partintro>

 &reference.datetime.entities.dateinterval;

</phpdoc:classref>

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