Bug #81660 [Com]: DateTimeZone::getTransitions() returns invalid data

From: Date: Fri, 26 Nov 2021 14:23:38 +0000
Subject: Bug #81660 [Com]: DateTimeZone::getTransitions() returns invalid data
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-237995@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=81660&edit=1

 ID:                 81660
 Comment by:         antonino dot spampinato86 at gmail dot com
 Reported by:        kenji dot uui at gmail dot com
 Summary:            DateTimeZone::getTransitions() returns invalid data
 Status:             Assigned
 Type:               Bug
 Package:            Date/time related
 Operating System:   macOS
 PHP Version:        8.1.0
 Assigned To:        derick
 Block user comment: N
 Private report:     N

 New Comment:

Currently @derick's patch from php> = 8.1.0beta3 without parameters returns from one (if it
has never used transition) or more transition arrays.
Otherwise with parameter it returns the last transition period of the year UTC which is different
from its local timezone if different from UTC. 2010-12-31 00:00:00 America/Chicago and 2011-01-01
06:00:00 UTC.
Do you want to calculate the time of the year between two dates?
that is to say:

array(5) {
    ["ts"]=>
    int(1300003200)
    ["time"]=>
    string(24) "2011-03-13T08:00:00+0000"
    ["offset"]=>
    int(-18000)
    ["isdst"]=>
    bool(true)
    ["abbr"]=>
    string(3) "CDT"
  }

relative to fix bug 80963


Previous Comments:
------------------------------------------------------------------------
[2021-11-26 10:00:13] cmb@php.net

Confirmed: <https://3v4l.org/MtJ2X>.

<https://www.timeanddate.com/time/zone/usa/chicago>
agrees with
behavior prior to PHP 8.1.0.

------------------------------------------------------------------------
[2021-11-26 06:49:50] kenji dot uui at gmail dot com

Description:
------------
DateTimeZone::getTransitions() changed between PHP 8.0.13 and 8.1.0. 


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

$tz = new DateTimeZone('America/Chicago');
$start = 1293861600;
$end = 1357020000;
$transitions = $tz->getTransitions($start, $end);
var_dump($transitions);

Expected result:
----------------
array(5) {
  [0]=>
  array(5) {
    ["ts"]=>
    int(1293861600)
    ["time"]=>
    string(24) "2011-01-01T06:00:00+0000"
    ["offset"]=>
    int(-21600)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "CST"
  }
  [1]=>
  array(5) {
    ["ts"]=>
    int(1300003200)
    ["time"]=>
    string(24) "2011-03-13T08:00:00+0000"
    ["offset"]=>
    int(-18000)
    ["isdst"]=>
    bool(true)
    ["abbr"]=>
    string(3) "CDT"
  }
  [2]=>
  array(5) {
    ["ts"]=>
    int(1320562800)
    ["time"]=>
    string(24) "2011-11-06T07:00:00+0000"
    ["offset"]=>
    int(-21600)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "CST"
  }
  [3]=>
  array(5) {
    ["ts"]=>
    int(1331452800)
    ["time"]=>
    string(24) "2012-03-11T08:00:00+0000"
    ["offset"]=>
    int(-18000)
    ["isdst"]=>
    bool(true)
    ["abbr"]=>
    string(3) "CDT"
  }
  [4]=>
  array(5) {
    ["ts"]=>
    int(1352012400)
    ["time"]=>
    string(24) "2012-11-04T07:00:00+0000"
    ["offset"]=>
    int(-21600)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "CST"
  }
}


Actual result:
--------------
array(1) {
  [0]=>
  array(5) {
    ["ts"]=>
    int(1293861600)
    ["time"]=>
    string(24) "2011-01-01T06:00:00+0000"
    ["offset"]=>
    int(-18000)
    ["isdst"]=>
    bool(true)
    ["abbr"]=>
    string(3) "CDT"
  }
}


------------------------------------------------------------------------



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