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examples.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 8cdc6621f9826d04abc3e50438c010804d7e8683 Maintainer: jbnahan Status: ready -->
<!-- Reviewed: no -->
<!-- CREDITS: DAnnebicque -->
<chapter xml:id="datetime.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
&reftitle.examples;
<section xml:id="datetime.examples-arithmetic">
<title>Arithmétique avec DateTime </title>
<para>
Les exemples suivants montrent quelques pièges de l'arithmétique de DateTime
en ce qui concerne les transitions DST et les mois ayant un nombre différent
de jours.
</para>
<para>
<example>
<title>DateTimeImmutable::add/sub ajout d'un interval de temps écoulé.</title>
<simpara>
Ajouter PT24H au dela d'une transition DST semblera ajouter 23/25 heures
(pour la plupart des fuseaux horaires).
</simpara>
<programlisting role="php">
<![CDATA[
<?php
$dt = new DateTimeImmutable("2015-11-01 00:00:00", new DateTimeZone("America/New_York"));
echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
$dt = $dt->add(new DateInterval("PT3H"));
echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Start: 2015-11-01 00:00:00 -04:00
End: 2015-11-01 02:00:00 -05:00
]]>
</screen>
</example>
</para>
<para>
<example>
<title>DateTimeImmutable::modify et strtotime incrémentation ou décrémentation de valeurs individuelles</title>
<simpara>
Ajouter +24 heures au dela d'une transition DST peut ajouter exactement 24
heures comme vu avec la chaîne date/time
(sauf si l'heure de début ou de fin est sur un point de transition).
</simpara>
<programlisting role="php">
<![CDATA[
<?php
$dt = new DateTimeImmutable("2015-11-01 00:00:00", new DateTimeZone("America/New_York"));
echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
$dt = $dt->modify("+24 hours");
echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Start: 2015-11-01 00:00:00 -04:00
End: 2015-11-02 00:00:00 -05:00
]]>
</screen>
</example>
</para>
<para>
<example>
<title>L'ajout ou la soustraction de dates/heures peut dépasser
(en plus ou en moins) des dates</title>
<simpara>
Comme pour 31 Janvier + 1 mois donnera comme résultat 2 Mars (année bisextile) ou
3 Mars (année normale).
</simpara>
<programlisting role="php">
<![CDATA[
<?php
echo "Normal year:\n"; // February has 28 days
$dt = new DateTimeImmutable("2015-01-31 00:00:00", new DateTimeZone("America/New_York"));
echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
$dt = $dt->modify("+1 month");
echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
echo "Leap year:\n"; // February has 29 days
$dt = new DateTimeImmutable("2016-01-31 00:00:00", new DateTimeZone("America/New_York"));
echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
$dt = $dt->modify("+1 month");
echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Normal year:
Start: 2015-01-31 00:00:00 -05:00
End: 2015-03-03 00:00:00 -05:00
Leap year:
Start: 2016-01-31 00:00:00 -05:00
End: 2016-03-02 00:00:00 -05:00
]]>
</screen>
<simpara>
Pour obtenir le dernier du mois prochain (autrement dit pour prévenir le
dépassement), le format <literal>last day of</literal> est disponible.
</simpara>
<programlisting role="php">
<![CDATA[
<?php
echo "Normal year:\n"; // February has 28 days
$dt = new DateTimeImmutable("2015-01-31 00:00:00", new DateTimeZone("America/New_York"));
echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
$dt = $dt->modify("last day of next month");
echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
echo "Leap year:\n"; // February has 29 days
$dt = new DateTimeImmutable("2016-01-31 00:00:00", new DateTimeZone("America/New_York"));
echo "Start: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
$dt = $dt->modify("last day of next month");
echo "End: ", $dt->format("Y-m-d H:i:s P"), PHP_EOL;
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Normal year:
Start: 2015-01-31 00:00:00 -05:00
End: 2015-02-28 00:00:00 -05:00
Leap year:
Start: 2016-01-31 00:00:00 -05:00
End: 2016-02-29 00:00:00 -05:00
]]>
</screen>
</example>
</para>
</section>
</chapter>
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sgml-always-quote-attributes:t
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->