<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="datetimeimmutable.add" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>DateTimeImmutable::add</refname>
  <refpurpose>
   Returns a new object, with added amount of days, months, years, hours, minutes and seconds
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis role="DateTimeImmutable">
   <modifier>public</modifier> <type>DateTimeImmutable</type><methodname>DateTimeImmutable::add</methodname>
   <methodparam><type>DateInterval</type><parameter>interval</parameter></methodparam>
  </methodsynopsis>
  <para>
   Creates a new <classname>DateTimeImmutable</classname> object, and adds the
   specified <classname>DateInterval</classname> object to this, to represent
   the new value.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <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.datetimeimmutable.return.modifiedobject;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title><function>DateTimeImmutable::add</function> example</title>
   <para>&style.oop;</para>
   <programlisting role="php">
<![CDATA[
<?php
$date = new DateTimeImmutable('2000-01-01');
$newDate = $date->add(new DateInterval('P10D'));
echo $newDate->format('Y-m-d') . "\n";
?>
]]>
   </programlisting>
  </example>

  <example>
   <title>Further <function>DateTimeImmutable::add</function> examples</title>
   <programlisting role="php">
<![CDATA[
<?php
$date = new DateTimeImmutable('2000-01-01');
$newDate = $date->add(new DateInterval('PT10H30S'));
echo $newDate->format('Y-m-d H:i:s') . "\n";

$date = new DateTimeImmutable('2000-01-01');
$newDate = $date->add(new DateInterval('P7Y5M4DT4H3M2S'));
echo $newDate->format('Y-m-d H:i:s') . "\n";
?>
]]>
   </programlisting>
   &example.outputs;
   <screen>
<![CDATA[
2000-01-01 10:00:30
2007-06-05 04:03:02
]]>
   </screen>
  </example>

  <example>
   <title>Beware when adding months</title>
   <programlisting role="php">
<![CDATA[
<?php
$date = new DateTimeImmutable('2000-12-31');
$interval = new DateInterval('P1M');

$newDate1 = $date->add($interval);
echo $newDate1->format('Y-m-d') . "\n";

$newDate2 = $newDate1->add($interval);
echo $newDate2->format('Y-m-d') . "\n";
?>
]]>
   </programlisting>
   &example.outputs;
   <screen>
<![CDATA[
2001-01-31
2001-03-03
]]>
   </screen>
  </example>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>DateTimeImmutable::sub</function></member>
   <member><function>DateTimeImmutable::diff</function></member>
   <member><function>DateTimeImmutable::modify</function></member>
  </simplelist>
 </refsect1>
</refentry>
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