在 PHP 中将 UTC 日期转换为本地时间

Convert UTC dates to local time in PHP

提问by Mark

I'm storing the UTC dates into the DB using:

我使用以下方法将 UTC 日期存储到数据库中：

$utc = gmdate("M d Y h:i:s A");

and then I want to convert the saved UTC date to the client's local time.

然后我想将保存的 UTC 日期转换为客户端的本地时间。

How can I do that?

我怎样才能做到这一点？

Thanks

谢谢

采纳答案by Amber

date()and localtime()both use the local timezone for the server unless overridden; you can override the timezone used with date_default_timezone_set().

date()并且localtime()都使用服务器除非被覆盖本地时区; 您可以覆盖使用的时区date_default_timezone_set()。

http://www.php.net/manual/en/function.date-default-timezone-set.php

http://www.php.net/manual/en/function.date-default-timezone-set.php

http://us3.php.net/manual/en/function.date.php

http://us3.php.net/manual/en/function.date.php

http://php.net/manual/en/function.localtime.php

http://php.net/manual/en/function.localtime.php

回答by webjprgm

PHP's strtotimefunction will interpret timezone codes, like UTC. If you get the date from the database/client without the timezone code, but know it's UTC, then you can append it.

PHP 的strtotime函数将解释时区代码，例如 UTC。如果您从没有时区代码的数据库/客户端获取日期，但知道它是 UTC，那么您可以附加它。

Assuming you get the date with timestamp code (like "Fri Mar 23 2012 22:23:03 GMT-0700 (PDT)", which is what Javascript code ""+(new Date())gives):

假设您获得带有时间戳代码的日期（例如“2012 年 3 月 23 日星期五 22:23:03 GMT-0700 (PDT)”，这是 Javascript 代码""+(new Date())给出的内容）：

$time = strtotime($dateWithTimeZone);
$dateInLocal = date("Y-m-d H:i:s", $time);

Or if you don't, which is likely from MySQL, then:

或者，如果您不这样做，这可能来自 MySQL，那么：

$time = strtotime($dateInUTC.' UTC');
$dateInLocal = date("Y-m-d H:i:s", $time);

回答by Timo Huovinen

Answer

回答

Convert the UTC datetime to America/Denver

将 UTC 日期时间转换为 America/Denver

// create a $dt object with the UTC timezone
$dt = new DateTime('2016-12-12 12:12:12', new DateTimeZone('UTC'));

// change the timezone of the object without changing it's time
$dt->setTimezone(new DateTimeZone('America/Denver'));

// format the datetime
$dt->format('Y-m-d H:i:s T');

Notes

笔记

time()returns the unix timestamp, which is a number, it has no timezone.

time()返回unix timestamp，它是一个数字，它没有时区。

date('Y-m-d H:i:s T')returns the date in the current locale timezone.

date('Y-m-d H:i:s T')返回当前语言环境时区的日期。

gmdate('Y-m-d H:i:s T')returns the date in UTC

gmdate('Y-m-d H:i:s T')返回 UTC 日期

date_default_timezone_set()changes the current locale timezone

date_default_timezone_set()更改当前语言环境时区

to change a time in a timezone

更改时区中的时间

// create a $dt object with the America/Denver timezone
$dt = new DateTime('2016-12-12 12:12:12', new DateTimeZone('America/Denver'));

// change the timezone of the object without changing it's time
$dt->setTimezone(new DateTimeZone('UTC'));

// format the datetime
$dt->format('Y-m-d H:i:s T');

here you can see all the available timezones

在这里你可以看到所有可用的时区

https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

here are all the formatting options

这是所有格式选项

http://php.net/manual/en/function.date.php

http://php.net/manual/en/function.date.php

Update PHP timezone DB (in linux)

更新 PHP 时区数据库（在 linux 中）

sudo pecl install timezonedb

回答by fijiaaron

Date arithmetic is not needed if you just want to display the same timestamp in different timezones:

如果您只想在不同的时区显示相同的时间戳，则不需要日期算法：

$format = "M d, Y h:ia";
$timestamp = gmdate($format);

date_default_timezone_set("UTC");
$utc_datetime = date($format, $timestamp);

date_default_timezone_set("America/Guayaquil");
$local_datetime = date($format, $timestamp);

回答by fijiaaron

First, get the date in UTC -- you've already done that so this step would really just be a database call:

首先，获取 UTC 日期——您已经这样做了，所以这一步实际上只是一个数据库调用：

$timezone = "UTC";
date_default_timezone_set($timezone);

$utc = gmdate("M d Y h:i:s A");
print "UTC: " . date('r', strtotime($utc)) . "\n";

Next, set your local time zone in PHP:

接下来，在 PHP 中设置您的本地时区：

$timezone = "America/Guayaquil";
date_default_timezone_set($timezone);

And now get the offset in seconds:

现在以秒为单位获取偏移量：

$offset = date('Z', strtotime($utc));
print "offset: $offset \n";

Finally, add the offset to the integer timestamp of your original datetime:

最后，将偏移量添加到原始日期时间的整数时间戳：

print "LOCAL: " . date('r', strtotime($utc) + $offset) . "\n";

回答by wdog

I store date in the DB in UTC format but then I show them to the final user in their local timezone

我以 UTC 格式将日期存储在数据库中，然后我将它们显示给本地时区的最终用户

// retrieve
$d = (new \DateTime($val . ' UTC'))->format('U');
return date("Y-m-d H:i:s", $d);

回答by Saurabh-Magento2-Developer

Here I am sharing the script, convert UTC timestamp to Indian timestamp:-

我在这里分享脚本，将UTC时间戳转换为印度时间戳：-

    // create a $utc object with the UTC timezone
    $IST = new DateTime('2016-12-12 12:12:12', new DateTimeZone('UTC'));

    // change the timezone of the object without changing it's time
    $IST->setTimezone(new DateTimeZone('Asia/Kolkata'));

    // format the datetime
   echo $IST->format('Y-m-d H:i:s T');

回答by Apostolos

Here is a straight way to convert the UTC time of the questioner to local time. This is for a stored time in a database etc., i.e. anytime. You just have to find the time difference between UTC time and the local time you are interested in and then ajust the stored UTC time adding to it the difference.

这是将提问者的 UTC 时间转换为本地时间的直接方法。这是针对在数据库等中存储的时间，即任何时间。您只需要找到 UTC 时间和您感兴趣的本地时间之间的时差，然后调整存储的 UTC 时间并将其添加到其中。

$df = "G:i:s";  // Use a simple time format to find the difference
$ts1 = strtotime(date($df));   // Timestamp of current local time
$ts2 = strtotime(gmdate($df)); // Timestamp of current UTC time
$ts3 = $ts1-$ts2;              // Their difference

You can then add this difference to the stored UTC time. (In my place, Athens, the difference is exactly 5:00:00)

然后，您可以将此差异添加到存储的 UTC 时间。（在我的地方，雅典，时差正好是 5:00:00）

Example:

例子：

$time = time() // Or any other timestamp
$time += $ts3  // Add the difference
$dateInLocal = date("Y-m-d H:i:s", $time);

回答by Henry

Given a local timezone, such as 'America/Denver', you can use DateTime class to convert UTC timestamp to the local date:

给定本地时区，例如“美国/丹佛”，您可以使用 DateTime 类将 UTC 时间戳转换为本地日期：

$timestamp = *********;
$date = new DateTime("@" . $timestamp);
$date->setTimezone(new DateTimeZone('America/Denver'));
echo $date->format('Y-m-d H:i:s');

回答by Senthur Pandi S

$UTC_Time   = "2018-07-06 06:06:16";
echo "UTC Time ".$UTC_Time;
$Indian_Time = TimeConverion($UTC_Time);
echo "<br> Indian_Time ".$Indian_Time;

function TimeConverion($UTC_Time) {
  date_default_timezone_set('Europe/London');
  $sTime = date("Y-m-d h:i:sa");
  $ts3 = strtotime(date("G:i:s"))-strtotime($sTime); 
  $utc = explode(" ",$UTC_Time);
  $time = strtotime($utc[1]);
  date_default_timezone_set("Asia/Calcutta");
  $time += $ts3;  // Add the difference
  return $utc[0]." ".date("H:i:s", $time);
}