DateTime::setTimezone

date_timezone_set

(PHP 5 >= 5.2.0, PHP 7)

DateTime::setTimezone -- date_timezone_setEstablece la zona horaria para el objeto DateTime

Descripción

Estilo orientado a objetos

public DateTime DateTime::setTimezone ( DateTimeZone $timezone )

Estilo por procedimientos

Establece una nueva zona horaria para un object de DateTime.

Parámetros

object

Solamente para el estilo por procedimientos: Un objeto DateTime devuelto por date_create(). La función modifica este objeto.

timezone

Un objeto DateTimeZone que representa la zona horaria deseada.

Valores devueltos

Devuelve el objeto DateTime para la cadena de métodos o FALSE en caso de error.

Historial de cambios

Versión Descripción
5.3.0Se ha cambiado el valor devuelto en caso de éxito de NULL a DateTime.

Ejemplos

Ejemplo #1 Ejemplo de DateTime::setTimeZone()

Estilo orientado a objetos

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

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

Estilo por procedimientos

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

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

El resultado de los ejemplos sería:

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

Ver también

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User Contributed Notes 5 notes

up
16
jamsilver at gmail dot com
1 year 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
?>
up
4
keithm at aoeex dot com
6 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
3
salladin
4 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
1
forzi at mail333 dot com
1 year 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
balbuf
7 months ago
It appears that what forzi at mail333 dot com said is correct.

When you reset the timezone on a DateTime object using a timezone that was instantiated with a GMT offset (e.g. <?php new DateTimeZone('-0500'); ?>) the timestamp as reported by <?php $dt->format('U'); ?> changes.

However, the value reported by <?php $dt->getTimestamp(); ?> does _not_ change. Interestingly, once <?php $dt->getTimestamp(); is called, the value from <?php $dt->format('U'); ?> starts returning the correct timestamp. This appears to be a bug.

In any case, other output values from format() seem to be accurate, and the true timestamp is always accessible via getTimestamp().
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