Bug #68161 [NEW]: DateTime->modify "first day of this month"

From: thunberg at gmail dot com Operating system: Linux 2.6 PHP version: 5.6.1 Package: Date/time related Bug Type: Bug Bug description:DateTime->modify "first day of this month" Description: ------------ Using setTimestamp after modifying a DateTime object with "first day of this month" string results in the incorrect date and time. If "first day of this month" is replaced with something else like "tomorrow" it works fine. For some reason the example below appears to lock in the date component, but not the time. Test script: --------------- $time_start = new DateTime('2014-10-02'); echo $time_start->format('r') . "\n"; $time_start->modify('first day of this month'); echo $time_start->format('r') . "\n"; $time_start->setTimestamp(time()); echo $time_start->format('r') . "\n"; Expected result: ---------------- Current date and time Actual result: -------------- October 1st -- Edit bug report at https://bugs.php.net/bug.php?id=68161&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=68161&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=68161&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=68161&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=68161&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=68161&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=68161&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=68161&r=needscript Try newer version: https://bugs.php.net/fix.php?id=68161&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=68161&r=support Expected behavior: https://bugs.php.net/fix.php?id=68161&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=68161&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=68161&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=68161&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=68161&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=68161&r=dst IIS Stability: https://bugs.php.net/fix.php?id=68161&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=68161&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=68161&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=68161&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=68161&r=mysqlcfg