archived-doc-fr/reference/datetime/examples.xml

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<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 intervalle de temps écoulé.</title>
    <simpara>
     Ajouter PT24H au-delà 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-delà 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 jour 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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