Bug #63442 [Com]: DateTime::getTimestamp returns wrong value

Edit report at https://bugs.php.net/bug.php?id=63442&edit=1 ID: 63442 Comment by: mj1856 at hotmail dot com Reported by: sea128 at post dot cz Summary: DateTime::getTimestamp returns wrong value Status: Open Type: Bug Package: Date/time related Operating System: Windows 7 64 bit PHP Version: 5.4.8 Block user comment: N Private report: N New Comment: There's some other strangeness here also. Consider: $tz = new DateTimeZone('Europe/Paris'); $dt = new DateTime('2014-10-26T02:30', $tz); echo $dt->format(DateTime::ISO8601) . " (" . $dt->getTimeStamp() . ")\n"; $ts = $dt->getTimeStamp() - 3600; $dt = new DateTime("@$ts", new DateTimeZone('UTC')); $dt->setTimeZone($tz); echo $dt->format(DateTime::ISO8601) . " (" . $dt->getTimeStamp() . ")\n"; OUTPUT: 2014-10-26T02:30:00+0100 (1414287000) 2014-10-26T02:30:00+0200 (1414287000) So even though going through UTC fixed the offset shown in the formatting, it still adjusted the timestamp. The second value should have the timestamp 141283400. This is a really dangerous bug that has been sitting for too long. Please raise priority. Thanks. Previous Comments: ------------------------------------------------------------------------ [2012-11-05 16:35:30] sea128 at post dot cz Description: ------------ DateTime::getTimestamp() returns different value from DateTime::setTimestamp(). Problem is caused by time zone where is used daylight saving and time when timezone offset is switched. Test script: --------------- $tz = new DateTimeZone('Europe/Prague'); $date = new DateTime('now',$tz); $date->setTimestamp(1351386000); echo $date->getTimestamp() . "\n"; $date->setTimestamp(1351386000-3600); echo $date->getTimestamp() . "\n"; Expected result: ---------------- 1351386000 1351382400 Actual result: -------------- 1351386000 1351386000 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=63442&edit=1