DateTime::setTimezone

date_timezone_set

(PHP 5 >= 5.2.0)

DateTime::setTimezone -- date_timezone_setSets the time zone for the DateTime object

Description

Object oriented style

public DateTime DateTime::setTimezone ( DateTimeZone $timezone )

Procedural style

Sets a new timezone for a DateTime object.

Parameters

object

Procedural style only: A DateTime object returned by date_create(). The function modifies this object.

timezone

A DateTimeZone object representing the desired time zone.

Return Values

Returns the DateTime object for method chaining or FALSE on failure.

Changelog

Version Description
5.3.0Changed the return value on success from NULL to DateTime.

Examples

Example #1 DateTime::setTimeZone() example

Object oriented style

<?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";
?>

Procedural style

<?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";
?>

The above examples will output:

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

See Also

Коментарии

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.
2009-11-24 17:13:17
http://php5.kiev.ua/manual/ru/datetime.settimezone.html
Автор:
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"
**/

?>
2012-05-08 16:59:43
http://php5.kiev.ua/manual/ru/datetime.settimezone.html
<?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???
2014-09-30 18:02:46
http://php5.kiev.ua/manual/ru/datetime.settimezone.html
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
?>
2015-06-22 14:15:59
http://php5.kiev.ua/manual/ru/datetime.settimezone.html
Автор:
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 calledthe 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().
2016-02-07 21:44:06
http://php5.kiev.ua/manual/ru/datetime.settimezone.html
Автор:
Surprising that the timezone works only specified in the separated method in case if you'll use ->format('U').

this does NOT apply timezone +0200 in the $timestamp:

<?php
    $date 
= new DateTime(strtotime(time()), new DateTimeZone(system('date +%z')));
   
$timestamp $date->format('U');
?>

this will apply timezone +0200 in the $timestamp:

<?php
    $date 
= new DateTime(strtotime(time()));
   
$date->setTimezone(new DateTimeZone(system('date +%z')));
   
$timestamp $date->format('U');
?>
2016-11-03 13:13:54
http://php5.kiev.ua/manual/ru/datetime.settimezone.html

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