object of class datetime could not be converted to int
Because $newDate is an object of type DateTime, not a string. The documentation is explicit:
Returns new DateTime object formatted according to the specified format.
If you want to convert from a string to DateTime back to string to change the format, call DateTime::format at the end to get a formatted string out of your DateTime.
$newDate = DateTime::createFromFormat("l dS F Y", $dateFromDB);
$newDate = $newDate->format('d/m/Y'); // for example