Bug #81560 [NEW]: DateTime-Add($interval) endless loop for dst

From: mihailovb at gmail dot com Operating system: CentOS7 (and others) PHP version: 7.4.25 Package: Date/time related Bug Type: Bug Bug description:DateTime-Add($interval) endless loop for dst Description: ------------ PHP 7.4.25 (CentOS), 7.4.3(Ubuntu20.04), 7.2.34(Ubuntu20.04) It goes into an endless loop when trying to add a 15M interval only when working with "negative" timezones. Doesn't happen for European "pozitive" timezones Test script: --------------- <?php $timezoneDST = new DateTimeZone('America/New_York'); $date = new DateTime("2020-11-01", $timezoneDST); $dateInterval = new DateInterval('PT15M'); $counter = 0; while($counter < 500){ $date->add($dateInterval); $counter++; } var_dump($date); Expected result: ---------------- class DateTime#1 (3) { public $date => string(26) "2020-11-06 04:00:00.000000" public $timezone_type => int(3) public $timezone => string(16) "America/New_York" } Actual result: -------------- class DateTime#2 (3) { public $date => string(26) "2020-11-01 01:00:00.000000" public $timezone_type => int(3) public $timezone => string(16) "America/New_York" } -- Edit bug report at https://bugs.php.net/bug.php?id=81560&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=81560&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=81560&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=81560&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=81560&r=needscript Try newer version: https://bugs.php.net/fix.php?id=81560&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=81560&r=support Expected behavior: https://bugs.php.net/fix.php?id=81560&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=81560&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=81560&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=81560&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=81560&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=81560&r=dst IIS Stability: https://bugs.php.net/fix.php?id=81560&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=81560&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=81560&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=81560&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=81560&r=mysqlcfg