Bug #68078 [NEW]: Datetime comparisons ignore microseconds

From: stephen dot r dot burrows at gmail dot com Operating system: OS X 10.9.4 PHP version: Irrelevant Package: Date/time related Bug Type: Bug Bug description:Datetime comparisons ignore microseconds Description: ------------ Two datetimes with all values the same (except microseconds) always compare as "equal". To put it another way, if you're trying to find out which one came first, you can't. Test script: --------------- $dt1 = new DateTime("2014-09-19 17:16:35.694274 America/Los_Angeles"); $dt2 = new DateTime("2014-09-19 17:16:35.728291 America/Los_Angeles"); var_dump($dt1 < $dt2); # bool(false) var_dump($dt1 == $dt2); # bool(true) # Not setting timezone because already have same timezone. var_dump($dt1->format("Y-m-d H:i:s.u") < $dt2->format("Y-m-d H:i:s.u")); # bool(true) var_dump($dt1->format("Y-m-d H:i:s.u") == $dt2->format("Y-m-d H:i:s.u")); # bool(false) Expected result: ---------------- The smaller datetime should compare as less than the larger one. To put this another way, the comparison of the objects should be the same whether you're comparing them as objects or as strings (and the string version is clearly correct IMO.) -- Edit bug report at https://bugs.php.net/bug.php?id=68078&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=68078&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=68078&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=68078&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=68078&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=68078&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=68078&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=68078&r=needscript Try newer version: https://bugs.php.net/fix.php?id=68078&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=68078&r=support Expected behavior: https://bugs.php.net/fix.php?id=68078&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=68078&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=68078&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=68078&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=68078&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=68078&r=dst IIS Stability: https://bugs.php.net/fix.php?id=68078&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=68078&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=68078&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=68078&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=68078&r=mysqlcfg