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<refentry xml:id="datetime.add" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>DateTime::add</refname>
  <refname>date_add</refname>
  <refpurpose>
   Modifies a DateTime object, with added amount of days, months, years, hours, minutes and seconds
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <para>&style.oop;</para>
  <methodsynopsis role="DateTime">
   <modifier>public</modifier> <type>DateTime</type><methodname>DateTime::add</methodname>
   <methodparam><type>DateInterval</type><parameter>interval</parameter></methodparam>
  </methodsynopsis>
  <para>&style.procedural;</para>
  <methodsynopsis>
   <type>DateTime</type><methodname>date_add</methodname>
   <methodparam><type>DateTime</type><parameter>object</parameter></methodparam>
   <methodparam><type>DateInterval</type><parameter>interval</parameter></methodparam>
  </methodsynopsis>

  <para>
   Adds the specified <classname>DateInterval</classname> object to the
   specified <classname>DateTime</classname> object.
  </para>
  <para>
   Like <methodname>DateTimeImmutable::add</methodname> but works with
   <classname>DateTime</classname>.
  </para>
  <para>
   The procedural version takes the <classname>DateTime</classname> object as
   its first argument.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   &date.datetime.description.modified;
   <varlistentry>
    <term>
     <parameter>interval</parameter>
    </term>
    <listitem>
     <para>
      A <classname>DateInterval</classname> object
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &date.datetime.return.modifiedobject;
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>DateTimeImmutable::add</function></member>
  </simplelist>
 </refsect1>

</refentry>
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