Bug #80913 [NEW]: DateTime(Immutable)::sub around DST yield incorrect time
From: acm at tweakers dot net
Operating system: all
PHP version: 8.0.3
Package: Date/time related
Bug Type: Bug
Bug description:DateTime(Immutable)::sub around DST yield incorrect time
Description:
------------
DateTimeImmutable and DateTime with a time like '2021-03-28 03:00:00' in
'Europe/Amsterdam' (i.e. the moment of the DST-transition) will give the
wrong time when substracting less than an hour.
The same goes for all times that will give a result within an hour from
03:00+02:00.
I.e. when substracting 30 minutes, you get the same time as when
_adding_ (+60-30 = ) 30 minutes.
And the same when using DateTimeImmutable. The before-output should be
01:30+01:00.
https://3v4l.org/ZZjvq (DateTimeImmutable)
https://3v4l.org/v3u2v (DateTime)
Btw substracting 60 minutes gives the exact same time again
(03:00:00+02:00), while substracting 61 minutes correctly gives
"2021-03-28T00:59:00+01:00".
Test script:
---------------
$date = new DateTime('2021-03-28 03:00:00', new
DateTimeZone('Europe/Amsterdam'));
$_30mbefore = (clone $date)->sub(new DateInterval('PT30M'));
$_30mafter = (clone $date)->add(new DateInterval('PT30M'));
var_dump($date->format(DATE_ATOM));
var_dump($_30mbefore->format(DATE_ATOM));
var_dump($_30mafter->format(DATE_ATOM));
Expected result:
----------------
string(25) "2021-03-28T03:00:00+02:00"
string(25) "2021-03-28T01:30:00+01:00" (correct)
string(25) "2021-03-28T03:30:00+02:00"
Actual result:
--------------
string(25) "2021-03-28T03:00:00+02:00"
string(25) "2021-03-28T03:30:00+02:00" (incorrect)
string(25) "2021-03-28T03:30:00+02:00"
--
Edit bug report at https://bugs.php.net/bug.php?id=80913&edit=1
--
Fix committed: https://bugs.php.net/fix.php?id=80913&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=80913&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=80913&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=80913&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=80913&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=80913&r=support
Expected behavior: https://bugs.php.net/fix.php?id=80913&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=80913&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=80913&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=80913&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=80913&r=phptooold
Daylight Savings: https://bugs.php.net/fix.php?id=80913&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=80913&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=80913&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=80913&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=80913&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=80913&r=mysqlcfg
Thread (6 messages)
- acm at tweakers dot net