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<?php $dateTime = '2007-01-11 12:34:56'; preg_match('~(?<date>\d{4}-\d{2}-\d{2})\s?(?<time>\d{2}:\d{2}:\d{2})?~', $dateTime, $matches); $matches['time'] = array_key_exists('time', $matches) ? $matches['time'] :'00:00:00'; var_dump($matches); $dateTime = vsprintf('%1s %4s', $matches); var_dump($dateTime);