Bug #76530 [Opn->Dup]: Timezone is incorrectly applied when converting dates beyond 2037

Edit report at https://bugs.php.net/bug.php?id=76530&edit=1 ID: 76530 Updated by: requinix@php.net Reported by: mlambley at gmail dot com Summary: Timezone is incorrectly applied when converting dates beyond 2037 -Status: Open +Status: Duplicate Type: Bug Package: Scripting Engine problem Operating System: Windows 10, FreeBSD, others PHP Version: 7.2.7 Block user comment: N Private report: N New Comment: Duplicate of bug #64992 Previous Comments: ------------------------------------------------------------------------ [2018-06-26 03:52:12] mlambley at gmail dot com Description: ------------ Right now, it is not daylight savings in Adelaide, Australia. Converting a \DateTime object with 2037-10-04 or earlier into ISO 8601 (format 'c') correctly makes the time zone +09:30 However, any date beyond this will incorrectly add the daylight savings to the time zone +10:30 Please note that this issue may be time sensitive. If you're executing the code during the Australian summer you may not be able to reproduce the results. Confirmed not working on a freshly downloaded, unmodified version of PHP v7.2.7 Test script: --------------- <?php date_default_timezone_set('Australia/Adelaide'); $date1 = new DateTime('2037-10-05'); var_dump($date1->format('c')); $date2 = new DateTime('2037-10-04'); var_dump($date2->format('c')); Expected result: ---------------- string(25) "2037-10-05T00:00:00+09:30" string(25) "2037-10-04T00:00:00+09:30" Actual result: -------------- string(25) "2037-10-05T00:00:00+10:30" string(25) "2037-10-04T00:00:00+09:30" ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=76530&edit=1