DateTimeImmutable::createFromTimestamp() uses UTC timezone

Affected page

https://www.php.net/manual/en/datetimeimmutable.createfromtimestamp.php

Current issue

It is not documented that createFromTimestamp() sets the timezone to UTC. Which is unexpected, because the absence of a timezone normally uses date_default_timezone_get().

Suggested improvement

1. Document the unexpected UTC timezone.

2. Document the (very ugly) workaround

DateTimeImmutable::createFromTimestamp($someTimestamp)->setTimezone(new DateTimeZone(date_default_timezone_get()));

Additional context (optional)

I created a test at https://3v4l.org/d3Rq1#v8.5.7 which demonstrates the current behaviour.

<?php

if (!date_default_timezone_set('Europe/Amsterdam')) {
    throw new Exception('Timezone Europe/Amsterdam does not exist?');
}

echo 'Default timezone: '.date_default_timezone_get().PHP_EOL;
var_dump(new DateTimeZone(date_default_timezone_get()));

$someTimestamp = strtotime('2026-07-03 14:22:17');

echo '--- date'.PHP_EOL;
echo date('Y-m-d H:i:s', $someTimestamp).PHP_EOL;

echo '--- DateTimeImmutable::createFromTimestamp() defaults to UTC timezone'.PHP_EOL;
$dt = DateTimeImmutable::createFromTimestamp($someTimestamp);
echo $dt->format('Y-m-d H:i:s').PHP_EOL;
var_dump($dt->getTimezone());

echo '--- DateTimeImmutable::createFromTimestamp() workaround for current timezone'.PHP_EOL;
$dt = DateTimeImmutable::createFromTimestamp($someTimestamp)->setTimezone(new DateTimeZone(date_default_timezone_get()));
echo $dt->format('Y-m-d H:i:s').PHP_EOL;
var_dump($dt->getTimezone());

outputs:

Default timezone: Europe/Amsterdam
object(DateTimeZone)#1 (2) {
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Europe/Amsterdam"
}
--- date
2026-07-03 14:22:17
--- DateTimeImmutable::createFromTimestamp() defaults to UTC timezone
2026-07-03 12:22:17                          !!!!!!!! NOTICE THE 2 HOURS DIFFERENCE  !!!!!!!!
object(DateTimeZone)#2 (2) {
  ["timezone_type"]=>
  int(1)
  ["timezone"]=>
  string(6) "+00:00"
}
--- DateTimeImmutable::createFromTimestamp() workaround for current timezone
2026-07-03 14:22:17
object(DateTimeZone)#1 (2) {
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Europe/Amsterdam"
}

Start with the affected DateTimeImmutable::createFromTimestamp() manual page and inspect its existing description and examples. Document that the method uses UTC and include the proposed workaround for the default timezone, then verify that the page clearly reflects the demonstrated behavior.