Bug #51689 [NEW]: Date::diff keeps subtracting after Date::sub

From: Operating system: Ubuntu 10.04 PHP version: 5.3.2 Package: Date/time related Bug Type: Bug Bug description:Date::diff keeps subtracting after Date::sub Description: ------------ After executing a sub() on a DateTime object, for every call of diff(), both DateTime objects start getting subtracted by the value that was passed on sub(). Test script: --------------- date_default_timezone_set('GMT'); $t1 = new DateTime('2010-01-01 00:00:00'); $t2 = new DateTime('2010-01-01 00:00:00'); $dif = new DateInterval('P1D'); $t2->sub($dif); $t1->sub($dif); for ($x = 0; $x < 3; $x++) { $t1->diff($t2); echo $t1->format("r\n"); echo $t2->format("r\n"); echo "\n"; } Expected result: ---------------- Fri, 01 Jan 2010 00:00:00 +0000 Fri, 01 Jan 2010 00:00:00 +0000 Fri, 01 Jan 2010 00:00:00 +0000 Fri, 01 Jan 2010 00:00:00 +0000 Fri, 01 Jan 2010 00:00:00 +0000 Fri, 01 Jan 2010 00:00:00 +0000 Actual result: -------------- Wed, 30 Dec 2009 00:00:00 +0000 Wed, 30 Dec 2009 00:00:00 +0000 Tue, 29 Dec 2009 00:00:00 +0000 Tue, 29 Dec 2009 00:00:00 +0000 Mon, 28 Dec 2009 00:00:00 +0000 Mon, 28 Dec 2009 00:00:00 +0000 -- Edit bug report at http://bugs.php.net/bug.php?id=51689&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=51689&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=51689&r=trysnapshot53 Try a snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=51689&r=trysnapshot60 Fixed in SVN: http://bugs.php.net/fix.php?id=51689&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=51689&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=51689&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=51689&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=51689&r=needscript Try newer version: http://bugs.php.net/fix.php?id=51689&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=51689&r=support Expected behavior: http://bugs.php.net/fix.php?id=51689&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=51689&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=51689&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=51689&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=51689&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=51689&r=dst IIS Stability: http://bugs.php.net/fix.php?id=51689&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=51689&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=51689&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=51689&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=51689&r=mysqlcfg