Bug #71511 [Opn->Dup]: Diff for februari not a month

Edit report at https://bugs.php.net/bug.php?id=71511&edit=1 ID: 71511 Updated by: heiglandreas@php.net Reported by: efrkool at live dot nl Summary: Diff for februari not a month -Status: Open +Status: Duplicate Type: Bug Package: Date/time related Operating System: CentOS Linux release 7.2.1511 (C PHP Version: 5.6.17 Block user comment: N Private report: N New Comment: This seems to be a duplicate of https://bugs.php.net/bug.php?id=52480 Previous Comments: ------------------------------------------------------------------------ [2016-02-03 13:38:19] efrkool at live dot nl Description: ------------ When calculating the number of months between the 1st of februari and the 1st of march I espect it to return 1 month but it returns 0. I first tought this had to do with the leap year but that doesn't have anything to do with it becouse it also happens for 2015. Test script: --------------- <?php $first = new \DateTime('2016-02-01 00:00:00', new \DateTimeZone('Europe/Amsterdam')); $second = new \DateTime('2016-03-01 00:00:00', new \DateTimeZone('Europe/Amsterdam')); $diff = $first->diff($second); echo $diff->format('%m') . PHP_EOL; // Expect: 1, got 0 $second->modify('+1 month'); $diff2 = $first->diff($second); echo $diff2->format('%m') . PHP_EOL; // Expect: 2, got 2 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=71511&edit=1