PHP UTC 到本地时间
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PHP UTC to Local Time
提问by John
Server Environment
服务器环境
Redhat Enterprise Linux
PHP 5.3.5
红帽企业 Linux
PHP 5.3.5
Problem
问题
Let's say I have a UTC date and time such as 2011-04-27 02:45 and I want to convert it to my local time, which is America/New_York.
假设我有一个 UTC 日期和时间，例如 2011-04-27 02:45，我想将其转换为我的本地时间，即 America/New_York。
Three questions:
三个问题：
1.) My code below might solve the problem, would you agree?
1.) 我下面的代码可能会解决问题，你同意吗？
<?php
date_default_timezone_set('America/New_York'); // Set timezone.
$utc_ts = strtotime("2011-04-27 02:45"); // UTC Unix timestamp.
// Timezone offset in seconds. The offset for timezones west of UTC is always negative,
// and for those east of UTC is always positive.
$offset = date("Z");
$local_ts = $utc_ts + $offset; // Local Unix timestamp. Add because $offset is negative.
$local_time = date("Y-m-d g:i A", $local_ts); // Local time as yyyy-mm-dd h:m am/pm.
echo $local_time; // 2011-04-26 10:45 PM
?>
2.) But, does the value of $offset automatically adjust for Daylight Savings Time (DST) ?
3.) If not, how should I tweak my code to automatically adjust for DST ?
Thank you :-)
2.) 但是，$offset 的值是否会根据夏令时 (DST) 自动调整？
3.) 如果没有，我应该如何调整我的代码以自动调整 DST ？
谢谢 ：-）
回答by Treffynnon
This will do what you want using PHPs native DateTimeand DateTimeZoneclasses:
这将使用 PHP 原生DateTime和DateTimeZone类执行您想要的操作：
$utc_date = DateTime::createFromFormat(
'Y-m-d G:i',
'2011-04-27 02:45',
new DateTimeZone('UTC')
);
$nyc_date = $utc_date;
$nyc_date->setTimeZone(new DateTimeZone('America/New_York'));
echo $nyc_date->format('Y-m-d g:i A'); // output: 2011-04-26 10:45 PM
See DateTime::createFromFormat man pagefor more information.
有关更多信息，请参阅DateTime::createFromFormat 手册页。
After some experimentation between time zones that do and do not currently have DSTI have discovered that this will take DST into account. The same conversion using my method above renders the same resulting time.
在当前有和没有 DST 的时区之间进行了一些实验后，我发现这将考虑 DST。使用我上面的方法进行相同的转换呈现相同的结果时间。
回答by lcompare
I know this is an old post, but there is another line you need to add to get the correct time.
我知道这是一个旧帖子，但是您需要添加另一行以获得正确的时间。
Before converting to local time, you need to set the default time zone to UTC like this (if it is the time zone of the time you are providing):
在转换为本地时间之前，您需要像这样将默认时区设置为 UTC（如果它是您提供的时间的时区）：
function GmtTimeToLocalTime($time) {
date_default_timezone_set('UTC');
$new_date = new DateTime($time);
$new_date->setTimeZone(new DateTimeZone('America/New_York'));
return $new_date->format("Y-m-d h:i:s");
}
回答by Ainz Ooal Gown
I'll improve on Hasin Hayder's answer
我会改进 Hasin Hayder 的回答
date_default_timezone_set('America/New_York'); // Set timezone.
$utc_ts = strtotime("2011-04-27 02:45 UTC"); // UTC Unix timestamp.
echo date('Y-m-d H:i:s a T', $utc_ts);
It should output
它应该输出
2011-04-26 10:45:00 pm EDT
The difference is adding the source Timezone. strtotime() accepts timezone too you know! :p
不同之处在于添加源时区。strtotime() 也接受时区，你知道！:p
回答by Hasin Hayder
date_default_timezone_set('America/New_York'); // Set timezone.
$utc_ts = strtotime("2011-04-27 02:45"); // UTC Unix timestamp.
Just after this executing this, $utc_ts contains the local time. PHP handles the DST itself.
在执行此操作之后， $utc_ts 包含本地时间。PHP 自己处理 DST。
=H=
=H=
