From: Operating system: Linux PHP version: 5.3.6 Package: Date/time related Bug Type: Bug Bug description:DateTime Object does not always update using DateTime::add method
Description: ------------ The DateTime class does not seem to update the object properly, specifically when the 'time' specified in the constructor of the object is relative time format (such as `first day of this month`). The test case is reproducible on PHP 5.3.6 as well as PHP 5.3.2 using the test script I've included below. A DateTime::diff after using a DateTime::add method on the object results in 0 for all periods (when the period specified with DateInterval is in Days). This clearly is not the expected behavior as using PT24H will increase the object date by one day, but not result in objects date being updated, while P1D (or P1W - which translates to days) will have no effect at all. Test script: --------------- $timezone = new DateTimeZone(date_default_timezone_get()); $times['relative1'] = new DateTime('first day of this month', $timezone); $times['relative2'] = new DateTime('-1 week', $timezone); $times['fixed'] = new DateTime('4/1/2011 12:00:00 AM', $timezone); $intervals['PT24H'] = new DateInterval('PT24H'); $intervals['P1D'] = new DateInterval('P1D'); $intervals['P1W'] = new DateInterval('P1W'); $intervals['P1M'] = new DateInterval('P1M'); $intervals['P1Y'] = new DateInterval('P1Y'); echo "<pre>"; foreach ($times as $type => $time) { foreach ($intervals as $period => $interval) { $str = "From " . $time->format('m/d/Y H:i:s') . " To "; $last_time = new DateTime($time->format('m/d/Y H:i:s')); $time->add($interval); $str .= $time->format('m/d/Y h:i:s') . " - PERIOD: $period"; echo "<b>Using <i>$type</i> $str</b>\r\n"; echo $time->diff($last_time)->format('%y years, %m months, %d days, %h hours, %i minutes, %s seconds.') . '<br />'; } } echo "</pre>"; Expected result: ---------------- Specify a DateTime object using relative time format of 'first day of this month' DateTime object updates by 1 day when using DateTime::add() with a DateInterval('P1D') on that object. Actual result: -------------- DateTime object does not update even though the DateInterval is valid and works on other DateTime objects of different, or non-relative, time. -- Edit bug report at http://bugs.php.net/bug.php?id=54516&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=54516&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=54516&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=54516&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=54516&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=54516&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=54516&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=54516&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=54516&r=needscript Try newer version: http://bugs.php.net/fix.php?id=54516&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=54516&r=support Expected behavior: http://bugs.php.net/fix.php?id=54516&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=54516&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=54516&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=54516&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=54516&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=54516&r=dst IIS Stability: http://bugs.php.net/fix.php?id=54516&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=54516&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=54516&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=54516&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=54516&r=mysqlcfg