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Bug #76182 DateTime::diff does not respect timezone offset
Submitted: 2018-04-03 23:58 UTC Modified: 2021-07-26 22:01 UTC
Avg. Score:3.0 ± 1.6
Reproduced:1 of 2 (50.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: zerkms at zerkms dot ru Assigned:
Status: Verified 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
If you subtract timezones from the different sides of the standard/dst time boundary - the result is wrong.

Test script:

$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:
string(25) "2018-04-01T03:10:00+12:00"
string(25) "2018-04-01T02:10:00+13:00"
string(1) "2"

Actual result:
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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 [2021-07-26 22:01 UTC]
-Status: Open +Status: Verified
 [2021-07-26 22:01 UTC]
Yeah, that doesn't look right: <>.
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