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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="intlcalendar.add" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>IntlCalendar::add</refname>
<refpurpose>Add a (signed) amount of time to a field</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<para>
&style.oop;
</para>
<methodsynopsis role="IntlCalendar">
<modifier>public</modifier> <type>bool</type><methodname>IntlCalendar::add</methodname>
<methodparam><type>int</type><parameter>field</parameter></methodparam>
<methodparam><type>int</type><parameter>value</parameter></methodparam>
</methodsynopsis>
<para>
&style.procedural;
</para>
<methodsynopsis>
<type>bool</type><methodname>intlcal_add</methodname>
<methodparam><type>IntlCalendar</type><parameter>calendar</parameter></methodparam>
<methodparam><type>int</type><parameter>field</parameter></methodparam>
<methodparam><type>int</type><parameter>value</parameter></methodparam>
</methodsynopsis>
<para>
Add a signed amount to a field. Adding a positive amount allows advances in
time, even if the numeric value of the field decreases (e.g. when working
with years in BC dates).
</para>
<para>
Other fields may need to adjusted – for instance, adding a month to the 31st
of January will result in the 28th (or 29th) of February. Contrary to
<function>IntlCalendar::roll</function>, when a value wraps around, more
significant fields may change. For instance, adding a day to the 31st of
January will result in the 1st of February, not the 1st of January.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>calendar</parameter></term>
<listitem>
&intl.parameter.intl-calendar;
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>field</parameter></term>
<listitem>
&reference.intl.incfieldparam;
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>value</parameter></term>
<listitem>
<para>
The signed amount to add to the current field. If the amount is positive,
the instant will be moved forward; if it is negative, the instant will be
moved into the past. The unit is implicit to the field type. For instance,
hours for <constant>IntlCalendar::FIELD_HOUR_OF_DAY</constant>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns &true; on success&return.falseforfailure;.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>IntlCalendar::add</function></title>
<programlisting role="php">
<![CDATA[
<?php
ini_set('intl.default_locale', 'fr_FR');
ini_set('date.timezone', 'UTC');
$cal = new IntlGregorianCalendar(2012, 0 /* January */, 31);
echo IntlDateFormatter::formatObject($cal), "\n";
$cal->add(IntlCalendar::FIELD_MONTH, 1);
echo IntlDateFormatter::formatObject($cal), "\n";
$cal->add(IntlCalendar::FIELD_DAY_OF_MONTH, 1);
echo IntlDateFormatter::formatObject($cal), "\n";
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
31 janv. 2012 00:00:00
29 févr. 2012 00:00:00
1 mars 2012 00:00:00
]]>
</screen>
</example>
</para>
</refsect1>
</refentry>
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