PHPKonf İstanbul PHP Conference 2015

DateTime::setTimezone

date_timezone_set

(PHP 5 >= 5.2.0)

DateTime::setTimezone -- date_timezone_setLegt die Zeitzone für ein DateTime Objekt fest

Beschreibung

Objektorientierter Stil

public DateTime DateTime::setTimezone ( DateTimeZone $timezone )

Prozeduraler Stil

Legt eine neue Zeitzone für ein DateTime Objekt fest.

Parameter-Liste

object

Nur bei prozeduralem Aufruf: Ein von date_create() zurückgegebenes DateTime-Objekt. Diese Funktion verändert dieses Objekt.

timezone

Ein DateTimeZone Objekt, das die gewünschte Zeitzone repräsentiert.

Rückgabewerte

Gibt das DateTime-Objekt für die Verkettung von Methoden zurück Im Fehlerfall wird FALSE zurückgegeben.

Changelog

Version Beschreibung
5.3.0Der Rückgabewert bei Erfolg wurde von NULL auf DateTime geändert.

Beispiele

Beispiel #1 DateTime::setTimeZone() Beispiel

Objektorientierter Stil

<?php
$date 
= new DateTime('2000-01-01', new DateTimeZone('Pacific/Nauru'));
echo 
$date->format('Y-m-d H:i:sP') . "\n";

$date->setTimezone(new DateTimeZone('Pacific/Chatham'));
echo 
$date->format('Y-m-d H:i:sP') . "\n";
?>

Prozeduraler Stil

<?php
$date 
date_create('2000-01-01'timezone_open('Pacific/Nauru'));
echo 
date_format($date'Y-m-d H:i:sP') . "\n";

date_timezone_set($datetimezone_open('Pacific/Chatham'));
echo 
date_format($date'Y-m-d H:i:sP') . "\n";
?>

Die obigen Bespiele erzeugen folgende Ausgabe:

2000-01-01 00:00:00+12:00
2000-01-01 01:45:00+13:45

Siehe auch

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User Contributed Notes 4 notes

up
8
salladin
3 years ago
I found unexpected behaviour when passing a timestamp.
timezone seems to always be GMT+0000 unless setTimezone() is set.

<?php

$MNTTZ
= new DateTimeZone('America/Denver');
$ts = 1336476757;

$dt = new DateTime("@$ts", $MNTTZ);
var_dump($dt->format('T'), $dt->format('U'));

$dt->setTimezone($MNTTZ);
var_dump($dt->format('T'), $dt->format('U'));

/** Output:
string(8) "GMT+0000"
string(10) "1336476757"
string(3) "MDT"
string(10) "1336476757"
**/

?>
up
6
keithm at aoeex dot com
5 years ago
The timestamp value represented by the DateTime object is not modified when you set the timezone using this method.  Only the timezone, and thus the resulting display formatting, is affected.

This can be seen using the following test code:
<?php
$MNTTZ
= new DateTimeZone('America/Denver');
$ESTTZ = new DateTimeZone('America/New_York');

$dt = new DateTime('11/24/2009 2:00 pm', $MNTTZ);
var_dump($dt->format(DATE_RFC822), $dt->format('U'));
$dt->setTimezone($ESTTZ);
var_dump($dt->format(DATE_RFC822), $dt->format('U'));

/** Output:
string(29) "Tue, 24 Nov 09 14:00:00 -0700"
string(10) "1259096400"
string(29) "Tue, 24 Nov 09 16:00:00 -0500"
string(10) "1259096400"
**/
?>

As such, you can use this to easily convert between timezones for display purposes.
up
1
forzi at mail333 dot com
9 months ago
<?php
$MNTTZ
= new DateTimeZone('America/Denver');
$ESTTZ = new DateTimeZone('America/New_York');

$dt = new DateTime('11/24/2009 2:00 pm', $MNTTZ);
var_dump($dt->format(DATE_RFC822), $dt->format('U'));
$dt->setTimezone($ESTTZ);
var_dump($dt->format(DATE_RFC822), $dt->format('U'));
?>
doesn't changes timestamp
But
<?php
$MNTTZ
= new DateTimeZone('America/Denver');
$ESTTZ = new DateTimeZone('-0500');

$dt = new DateTime('11/24/2009 2:00 pm', $MNTTZ);
var_dump($dt->format(DATE_RFC822), $dt->format('U'));
$dt->setTimezone($ESTTZ);
var_dump($dt->format(DATE_RFC822), $dt->format('U'));
?>
changes timestamp

It is possible to fix that by:
<?php
$timestamp
= $date->getTimestamp();
$date->setTimezone($value);
$date->setTimestamp($timestamp);
?>
But WTF???
up
0
jamsilver at gmail dot com
13 days ago
In response to the other comments expressing surprise that changing the timezone does not affect the timestamp:

A UNIX timestamp is defined as the number of seconds that have elapsed since 00:00:00 (UTC), Thursday, 1 January 1970.

So: with respect to UTC. Always.

Calling setTimezone() never changes the actual "absolute", underlying, moment-in-time itself. It only changes the timezone you wish to "view" that moment "from". Consider the following:

<?php
// A time in London.
$datetime = new DateTime('2015-06-22T10:40:25', new DateTimeZone('Europe/London'));

// I wonder how that SAME moment-in-time would
// be described in other places around the world.
$datetime->setTimezone(new DateTimeZone('Australia/Sydney'));
print
$datetime->format('Y-m-d H:i:s (e)');
 
// 2015-06-22 19:40:25 (Australia/Sydney)

$datetime->setTimezone(new DateTimeZone('America/New_York'));
print
$datetime->format('Y-m-d H:i:s (e)');
 
// 2015-06-22 05:40:25 (America/New_York)

$datetime->setTimezone(new DateTimeZone('Asia/Calcutta'));
print
$datetime->format('Y-m-d H:i:s (e)');
 
// 2015-06-22 15:10:25 (Asia/Calcutta)
?>

Please note that ALL of these date strings unambiguously represent the exact same moment-in-time. Therefore, calling getTimestamp() at any stage will return the same result:

<?php
$datetime
->getTimestamp();
 
// 1434966025
?>
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