note 94693 deleted from datetime.diff by danielc

Note Submitter: andarin2 at yahoo dot com ---- The DateInterval format unfortunately leads to inconsitencies: <?php $start = new DateTime('2009-01-01 00:00:00'); // 31 days $time_span = $start->diff(new DateTime('2009-02-01 00:00:00')); var_dump($time_span); // returns '1 month' $start = new DateTime('2009-02-01 00:00:00'); //28 days $time_span = $start->diff(new DateTime('2009-03-01 00:00:01')); var_dump($time_span); // returns '1 month' ?> Of course it is possible to guess what does DateTime mean for a month, but in such case the invoking program should take care of month lengths and leap years (imagine counting days between dates years appart) - DateTime class is supposed to do that. In my opinion this function should return a value in seconds (or any other stable unit). Afterwards the program would have to convert the value as needed, but the value would be exact.