Bug #72004 [NEW]: DateTime comparison unexpected behavior

From: mcloide1977 at gmail dot com Operating system: Ubuntu 14.04.3 LTS PHP version: 5.6.20 Package: Date/time related Bug Type: Bug Bug description:DateTime comparison unexpected behavior Description: ------------ When comparing 2 DateTime objects using comparison operators such as greater than, or less than, etc, you would expect that if DateTime object 1 has a timestamp that is greater than DateTime object 2 that it would return a truthful statement when being compared. While running some unit tests I managed to get some failures on a comparison test that simply did is $now >= $earlier. It, in all possible variations tested, failed where $now was never greater than or equals the $earlier DateTime object. That changed whenever there was a direct timestamp comparison happening or when the getTimeStamp method from the $now DateTime object. Before submitting this bug I have checked this bug report https://bugs.php.net/bug.php?id=68078 in which I had the hope that fixed the issue. It did not. The following test script was ran under: PHP 5.6.20-2+deb.sury.org~trusty+1 (cli) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies and under PHP 5.6.19 (cli) (built: Mar 14 2016 11:55:51) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies With the same end result. A copy of this test script can be found in: https://gist.github.com/mcloide/eb7db1cc38fe4c6476388902bda724c3 Test script: --------------- <?php foreach (['EST', 'EDT', 'CST', 'CDT', 'PST', 'PDT'] as $tz) { echo "---- TZ: $tz ---- \n"; $now = new DateTime('@' . (new DateTime('11:30 AM EST'))->getTimeStamp()); $earlier = new DateTime('7 AM', new DateTimeZone($tz)); echo $now->format('r') . "\n"; echo $earlier->format('r') . "\n"; $mod = $now->setTimeZone(new DateTimeZone($tz)); echo $now->format('r') . "\n"; echo $earlier->format('r') . "\n"; echo (int)($earlier < $now) . "\n"; echo $now->getTimestamp() . "\n"; echo (int)($earlier < $now) . "\n"; echo "------------------\n\n"; } Expected result: ---------------- When performing this comparison: echo (int)($earlier < $now) . "\n"; Regardless if getTimeStamp method is called the end result should be true. ---- TZ: CDT ---- Mon, 11 Apr 2016 16:30:00 +0000 Mon, 11 Apr 2016 07:00:00 -0600 Mon, 11 Apr 2016 10:30:00 -0600 Mon, 11 Apr 2016 07:00:00 -0600 1 1460392200 1 ------------------ Actual result: -------------- ---- TZ: CDT ---- Mon, 11 Apr 2016 16:30:00 +0000 Mon, 11 Apr 2016 07:00:00 -0600 Mon, 11 Apr 2016 10:30:00 -0600 Mon, 11 Apr 2016 07:00:00 -0600 0 1460392200 1 ------------------ -- Edit bug report at https://bugs.php.net/bug.php?id=72004&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72004&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72004&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72004&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72004&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72004&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72004&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72004&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72004&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72004&r=support Expected behavior: https://bugs.php.net/fix.php?id=72004&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72004&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72004&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72004&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72004&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72004&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72004&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72004&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72004&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72004&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72004&r=mysqlcfg