note 117691 added to function.date-diff

Even the top rated comment here, Sergio Abreu's, doesn't treat leap years entirely correctly. It should work between 1901 and 2099, but outside that it'll be a little off. If you want to find out the number of days between two dates, use below. You can change to a different unit from that. It looks a little insane, but keep in mind the full set of rules for leap years: If the year is divisible by 4, it's a leap year... - unless the year is divisible by 100, then it isn't... - - unless the year is divisible by 400, then it really is. So in the functions below, we find the total numbers of days in full years since the mythical 1/1/0001, then add the number of days before the current one in the year passed. Do this for each date, then return the absolute value of the difference. function days_diff($d1, $d2) { $x1 = days($d1); $x2 = days($d2); if ($x1 && $x2) { return abs($x1 - $x2); } } function days($x) { if (get_class($x) != 'DateTime') { return false; } $y = $x->format('Y') - 1; $days = $y * 365; $z = (int)($y / 4); $days += $z; $z = (int)($y / 100); $days -= $z; $z = (int)($y / 400); $days += $z; $days += $x->format('z'); return $days; } ---- Server IP: 72.52.91.14 Probable Submitter: 96.233.109.34 ---- Manual Page -- http://php.net/manual/en/function.date-diff.php Edit -- https://master.php.net/note/edit/117691 Del: integrated -- https://master.php.net/note/delete/117691/integrated Del: useless -- https://master.php.net/note/delete/117691/useless Del: bad code -- https://master.php.net/note/delete/117691/bad+code Del: spam -- https://master.php.net/note/delete/117691/spam Del: non-english -- https://master.php.net/note/delete/117691/non-english Del: in docs -- https://master.php.net/note/delete/117691/in+docs Del: other reasons-- https://master.php.net/note/delete/117691 Reject -- https://master.php.net/note/reject/117691 Search -- https://master.php.net/manage/user-notes.php