如何在 php 中从 GMT+0 检索时区偏移量？
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How to retrieve timezone offset from GMT+0 in php?
提问by Jér?me Verstrynge
I am no expert in php. I know timezones are supportedin PHP.
我不是 php 专家。我知道PHP支持时区。
For a given timezone TZ supported by PHP, I need to retrieve the offset (i.e., number of hours and minutes to add or substract) to a known UTC (i.e. GMT+0) to get that time in the TZ zone.
对于 PHP 支持的给定时区 TZ，我需要检索已知 UTC（即 GMT+0）的偏移量（即添加或减去的小时数和分钟数）以获取 TZ 区域中的时间。
How can I achieve this? Ultimately, I need to get those offsets for all supported timezones in PHP. Thanks.
我怎样才能做到这一点？最终，我需要为 PHP 中所有支持的时区获取这些偏移量。谢谢。
回答by Teneff
This is a simple example how to get timezone offset in seconds:
这是一个如何以秒为单位获取时区偏移的简单示例：
$dtz = new DateTimeZone('Europe/Sofia');
$time_in_sofia = new DateTime('now', $dtz);
echo $dtz->getOffset( $time_in_sofia );
to display it in the format GMT+x:
以 GMT+x 格式显示：
$offset = $dtz->getOffset( $time_in_sofia ) / 3600;
echo "GMT" . ($offset < 0 ? $offset : "+".$offset);
回答by Sundar
This will be useful for converting offset values into GMT format without any calculation
这对于将偏移值转换为 GMT 格式而不进行任何计算很有用
<?php
//target time zone
$target_time_zone = new DateTimeZone('America/Los_Angeles');
//find kolkata time
$date_time = new DateTime('now', $target_time_zone);
//get the exact GMT format
echo 'GMT '.$date_time->format('P');
回答by Alix Axel
This will get you the standard offset (not the one in orout of DST[depending on the time of year]):
这将为您提供标准偏移量（不是DST内或外的偏移量[取决于一年中的时间]）：
function getStandardOffsetUTC($timezone)
{
if($timezone == 'UTC') {
return '';
} else {
$timezone = new DateTimeZone($timezone);
$transitions = array_slice($timezone->getTransitions(), -3, null, true);
foreach (array_reverse($transitions, true) as $transition)
{
if ($transition['isdst'] == 1)
{
continue;
}
return sprintf('UTC %+03d:%02u', $transition['offset'] / 3600, abs($transition['offset']) % 3600 / 60);
}
return false;
}
}
Usage:
用法：
echo getStandardOffsetUTC('Europe/Sofia'); // UTC +02:00
You can get a peek at the differences here.
您可以在此处查看差异。
回答by MNR
It is possible just by the following single line.
只需通过以下单行即可。
echo (new DateTime('now', new DateTimeZone( 'Asia/Kabul' )))->format('P');
回答by J. Bruni
For all supported timezones in PHP:
对于 PHP 中所有支持的时区：
$timezone_offsets = array();
foreach(timezone_identifiers_list() as $timezone_identifier)
{
$date_time_zone = new DateTimeZone($timezone_identifier);
$date_time = new DateTime('now', $date_time_zone);
$timezone_offsets[$timezone_identifier] = $date_time_zone->getOffset($date_time);
}
print_r($timezone_offsets);
