Bug #66988 [Opn->Nab]: Modifying a time -1 month from the end of the month has unexpected results

Edit report at https://bugs.php.net/bug.php?id=66988&edit=1 ID: 66988 Updated by: requinix@php.net Reported by: jglw at live dot co dot uk Summary: Modifying a time -1 month from the end of the month has unexpected results -Status: Open +Status: Not a bug Type: Bug Package: Date/time related Operating System: Windows 7 PHP Version: 5.4.26 Block user comment: N Private report: N New Comment: "-1 month" works by literally subtracting 1 from the month. The resulting date 2014-02-31 overflows to 2014-03-03. There is no solution to the -1 problem that satisfies everyone. If you need it to become 2014-02-28 then apply a bit more logic: if the two months are the same then use the last day of the previous month instead. Previous Comments: ------------------------------------------------------------------------ [2014-03-31 15:53:10] jglw at live dot co dot uk Description: ------------ If you modify a time -1 month from the last day of a month it seems to interpret that as take away the number of days from the previous month. It would make more sense that if you modified a time by -1 month it wouldn't fall into the same month from which you modified it. Test script: --------------- <?php $time = strtotime("2014-03-31 -1 month"); echo date("Y-m-d", $time); ?> Expected result: ---------------- 2014-02-28 Actual result: -------------- 2014-03-03 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=66988&edit=1