blocks|key|1280924|text|如果您没有运行PHP5.3.0以上的版本(就像用the+manual编写的那样，您一定会在询问之前阅读它，对吧？)，setTimezone将返回NULL，而不是修改后的DateTime。您运行的是PHP+5.3.0或更高版本吗？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1280925|entityMap|0|LINK|mutability|MUTABLE|url|http://fi.php.net/manual/en/datetime.settimezone.php^0|1M|B|O|A|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

If you're not running at least PHP 5.3.0 (as written in <a href="http://fi.php.net/manual/en/datetime.settimezone.php" rel="noreferrer">the manual</a>, which you surely read before asking, right?), <code>setTimezone</code> will return NULL instead of the modified DateTime. Are you running at least PHP 5.3.0?

blocks|key|3444426|text|$date+=+$date->setTimezone(new+DateTimeZone('GMT'));|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3444427|使$date变量为空，您应该直接将其命名为：|3444428|$date->setTimezone(new+DateTimeZone('GMT'));|3444429|entityMap^0|0|1G|0|0|0|18|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

<code>$date = $date-&gt;setTimezone(new DateTimeZone('GMT'));</code>

Makes the $date variable null, you should just call it:

<code>$date-&gt;setTimezone(new DateTimeZone('GMT'));</code>

blocks|key|2036962|text|根据manual，如果setTimeZone不能设置时区，它将返回DateTime对象或FALSE。保存返回实际上是不必要的，因为它将修改您传递的DateTime对象。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2036963|也许您应该在将$date对象设置为其返回值之前检查setTimezone是否成功：|2036964|$timezone+=+"Asia/Karachi";
$date+=+new+DateTime($when_to_send,+new+DateTimeZone($timezone));

if+(!+($date+&&+$date->setTimezone(new+DateTimeZone('GMT')))+)+{
++++#+unable+to+adjust+from+local+timezone+to+GMT!
++++#+(display+a+warning)
}

$when_to_send+=+$date->format('Y-m-d+H:i:s');|code-block|syntax|javascript|2036965|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/datetime.settimezone.php^0|B|B|X|8|18|5|21|8|2|6|0|0|7|5|P|B|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

According to the <a href="http://www.php.net/manual/en/datetime.settimezone.php" rel="nofollow noreferrer">manual</a>, <code>setTimeZone</code> will return either a <code>DateTime</code> object or a <code>FALSE</code> if it can't set the timezone. Saving the return is actually unnecessary because it will modify the <code>DateTime</code> object you pass it.

Perhaps you should check whether <code>setTimezone</code> succeeded before setting your <code>$date</code> object to its return value:

<pre><code>$timezone = "Asia/Karachi";
$date = new DateTime($when_to_send, new DateTimeZone($timezone));

if (! ($date &amp;&amp; $date-&gt;setTimezone(new DateTimeZone('GMT'))) ) {
 # unable to adjust from local timezone to GMT!
 # (display a warning)
}

$when_to_send = $date-&gt;format('Y-m-d H:i:s');
</code></pre>

blocks|key|536103|text|感谢大家的帮助，但只能标上正确答案。正确的代码是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|536104|$timezone+=+"Asia/Karachi";+
$date+=+new+DateTime($when_to_send,+new+DateTimeZone($timezone));
$date->setTimezone(new+DateTimeZone('GMT'));+
$when_to_send+=+$date->format('Y-m-d+H:i:s');|code-block|syntax|javascript|536105|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Thanks for everyone who helped but only can be marked correct answer. Correct code is

<pre><code>$timezone = "Asia/Karachi"; 
$date = new DateTime($when_to_send, new DateTimeZone($timezone));
$date-&gt;setTimezone(new DateTimeZone('GMT')); 
$when_to_send = $date-&gt;format('Y-m-d H:i:s');
</code></pre>

Can anyone tell what is wrong with the code.

<pre><code>$timezone = "Asia/Karachi"; 
$date = new DateTime($when_to_send, new DateTimeZone($timezone));
$date = $date-&gt;setTimezone(new DateTimeZone('GMT')); 
$when_to_send = $date-&gt;format('Y-m-d H:i:s');
</code></pre>

error is: Call to a member function format() on a non-object

Whats wrong with DateTime object

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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有人能说出代码出了什么问题吗？$timezone = "Asia/Karachi"; $date = new DateTime($when_to_send, new DateTimeZone($timezone));$date = $date->setTimezone(new DateTimeZone('GMT'));...

问DateTime对象有什么问题
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