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Bug #76182 DateTime::diff does not respect timezone offset
Submitted: 2018-04-03 23:58 UTC Modified: -
Votes:1
Avg. Score:1.0 ± 0.0
Reproduced:0 of 1 (0.0%)
From: zerkms at zerkms dot ru Assigned:
Status: Open Package: Date/time related
PHP Version: 7.2.4 OS: Linux/Any
Private report: No CVE-ID: None
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From: zerkms at zerkms dot ru
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 [2018-04-03 23:58 UTC] zerkms at zerkms dot ru
Description:
------------
If you subtract timezones from the different sides of the standard/dst time boundary - the result is wrong.

Test script:
---------------
<?php

$dt = new \DateTime('2018-04-01 03:10:00', new \DateTimeZone('Pacific/Auckland'));

$dt2 = clone $dt;
$dt2->sub(new \DateInterval('PT2H'));

var_dump($dt > $dt2, $dt->format(\DateTime::RFC3339), $dt2->format(\DateTime::RFC3339), $dt->diff($dt2)->format('%h'));

Expected result:
----------------
bool(true)
string(25) "2018-04-01T03:10:00+12:00"
string(25) "2018-04-01T02:10:00+13:00"
string(1) "2"

Actual result:
--------------
bool(true)
string(25) "2018-04-01T03:10:00+12:00"
string(25) "2018-04-01T02:10:00+13:00"
string(1) "1"

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