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.
DateTime::setTimezone
(PHP 5 >= 5.2.0)
DateTime::setTimezone — DateTime オブジェクトのタイムゾーンを設定する
説明
返り値
変更後の DateTime を返します。
例
例1 DateTimeZone オブジェクトの設定と取得
<?php
date_default_timezone_set('Europe/London');
$datetime = new DateTime('2008-08-03 12:35:23');
echo $datetime->getTimezone()->getName() . "\n";
$datetime = new DateTime('2008-08-03 12:35:23');
$la_time = new DateTimeZone('America/Los_Angeles');
$datetime->setTimezone($la_time);
echo $datetime->getTimezone()->getName();
?>
上の例の出力は以下となります。
Europe/London America/Los_Angeles
参考
- DateTime::getTimezone() - 指定した DateTime に関連するタイムゾーンを返す
- timezone_open() - 新しい DateTimeZone オブジェクトを返す
DateTime::setTimezone
keithm at aoeex dot com
24-Nov-2009 11:13
24-Nov-2009 11:13
dan dot morin at gmail dot com
25-Jun-2009 07:56
25-Jun-2009 07:56
In my setup setTimezone() does modify the date, as well as the TZ.
Code:
<?php
$dt_obj = new DateTime('2009-06-25 12:00:00');
echo $dt_obj->format(DATE_RFC822) . "\n";
$dt_obj->setTimezone(new DateTimeZone('GMT'));
echo $dt_obj->format(DATE_RFC822);
?>
Output:
Thu, 25 Jun 09 12:00:00 -0400
Thu, 25 Jun 09 16:00:00 +0000
sht dot alien at gmx dot net
16-Jun-2009 04:13
16-Jun-2009 04:13
Btw: setTimezone() does NOT modify the date, just the TZ. I tested this just to make sure 'cause the documentation doesn't tell.
