<?php echo date('YmdHis', strtotime('1962-11-17T00:00:00+00:00')); // 19621117000000 print_r(DateTime::createFromFormat('U', strtotime('1962-11-17T00:00:00+00:00'), new \DateTimeZone('UTC'))->format('YmdHis')); // fails as createFromFormat returns false
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