--TEST-- PHPC-631: UTCDateTime::toDateTime() may return object that cannot be serialized --INI-- date.timezone=UTC --FILE-- toDateTime(); $s = serialize($datetime); var_dump($datetime); echo "\n", $s, "\n\n"; var_dump(unserialize($s)); ?> ===DONE=== --EXPECTF-- object(DateTime)#%d (%d) { ["date"]=> string(26) "2016-06-21 20:25:55.123000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" } O:8:"DateTime":3:{s:4:"date";s:26:"2016-06-21 20:25:55.123000";s:13:"timezone_type";i:1;s:8:"timezone";s:6:"+00:00";} object(DateTime)#%d (%d) { ["date"]=> string(26) "2016-06-21 20:25:55.123000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" } ===DONE===