note 127669 added to datetime.gettimestamp

The timestamp is always UTC and the DateTime constructor using the timestamp assumes UTC. Thus you cannot roundtrip the timestamp without adjusting for the local time zone. Consider the following code... $d0 = new \DateTime(); echo json_encode($d0).'<br>'; echo 'timestamp = '.$d0->getTimestamp().'<br>'; $d1 = new \DateTime('@'.$d0->getTimestamp()); echo json_encode($d1).'<br>'; This code will produce (with server time zone set to MST) "date":"2022-09-26 10:26:34.864244","timezone_type":3,"timezone":"America\/Phoenix"} timestamp = 1664213194 {"date":"2022-09-26 17:26:34.000000","timezone_type":1,"timezone":"+00:00"} ---- Server IP: 45.112.84.4 Probable Submitter: 185.85.3.173 (proxied: 71.228.120.105) ---- Manual Page -- https://php.net/manual/en/datetime.gettimestamp.php Edit -- https://main.php.net/note/edit/127669 Del: integrated -- https://main.php.net/note/delete/127669/integrated Del: useless -- https://main.php.net/note/delete/127669/useless Del: bad code -- https://main.php.net/note/delete/127669/bad+code Del: spam -- https://main.php.net/note/delete/127669/spam Del: non-english -- https://main.php.net/note/delete/127669/non-english Del: in docs -- https://main.php.net/note/delete/127669/in+docs Del: other reasons-- https://main.php.net/note/delete/127669 Reject -- https://main.php.net/note/reject/127669 Search -- https://main.php.net/manage/user-notes.php