note 88048 added to function.date

I'd love it if anyone knows why I am losing a day adding and then subtracting the same number of days from a date... //Prints "Add 140 days to 10-08-90 = 02-24-91" echo "Add 140 days to 10-08-90 = " . date("m-d-y", mktime(0, 0, 0, 10, 147, 1990)) . "<br/>"; //Prints "Subtract 140 days to 02-24-91 = 10-07-90" Why?? echo "Subtract 140 days to 02-24-91 = " . date("m-d-y", mktime(0, 0, 0, 02, 24-140, 1991)) . "<br/>"; ---- Server IP: 208.69.120.35 Probable Submitter: 158.121.200.89 ---- Manual Page -- http://www.php.net/manual/en/function.date.php Edit -- https://master.php.net/note/edit/88048 Del: integrated -- https://master.php.net/note/delete/88048/integrated Del: useless -- https://master.php.net/note/delete/88048/useless Del: bad code -- https://master.php.net/note/delete/88048/bad+code Del: spam -- https://master.php.net/note/delete/88048/spam Del: non-english -- https://master.php.net/note/delete/88048/non-english Del: in docs -- https://master.php.net/note/delete/88048/in+docs Del: other reasons-- https://master.php.net/note/delete/88048 Reject -- https://master.php.net/note/reject/88048 Search -- https://master.php.net/manage/user-notes.php