php时间戳有关问题

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Release: 2016-06-13 11:16:40
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php时间戳问题

本帖最后由 hongming271 于 2013-03-05 16:20:16 编辑 php函数中的date函数在某些系统(如 Windows)中限制为从 1970 年 1 月 1 日到 2038 年 1 月 19 日。

现在我有个时间戳是超过了2038年后,用date不能正常转化成正确的标准时间格式。

还有一个问题就是我有个时间戳1356969600,转化成正常效果是2013-1-1 00:00:00
例子 
$dt = new DateTime([email&#160;protected]');<br />echo $dt->format('Y-m-d H:i:s');
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通过例子转化却变成了2012-12-31 16:00:00,比正常效果足足少了八个小时


------解决方案--------------------

date_default_timezone_set("Europe/London");
$dt = new DateTime([email protected]');
echo $dt->getTimezone()->getName(),"\n";
echo $dt->format('Y-m-d H:i:s'), "\n";
echo date('Y-m-d H:i:s',1356969600),"\n";


date_default_timezone_set("Asia/Shanghai");
$dt = new DateTime([email protected]');
echo $dt->getTimezone()->getName(),"\n";
echo $dt->format('Y-m-d H:i:s'), "\n";
echo date('Y-m-d H:i:s',1356969600),"\n\n";


date_default_timezone_set("Asia/Shanghai");
$dt = new DateTime([email protected]');
echo $dt->getTimezone()->getName(),"\n";
echo $dt->format('Y-m-d H:i:s'), "\n";
echo date('Y-m-d H:i:s',1356969600),"\n";


$dt->setTimezone(new DateTimeZone('Asia/Shanghai'));
echo $dt->getTimezone()->getName(),"\n";
echo $dt->format('Y-m-d H:i:s'), "\n";
echo date('Y-m-d H:i:s',1356969600),"\n";

------解决方案--------------------
本帖最后由 xuzuning 于 2013-03-06 09:41:27 编辑

DateTime::format 被设计成不受外部设置影响(面向对象就应该如此)
所以无论你如何改变环境参数 date_default_timezone ,都不会影响输出结果

要想改变 DateTime::format 的时区设置,需要向
DateTime::setTimezone 传入一个时区对象 DateTimeZone

比如
$d = new DateTime([email&#160;protected]');<br />$d->setTimezone(new DateTimeZone('PRC'));<br />echo $d->format('Y-m-d H:i:s');<br />
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2013-01-01 00:00:00 
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