Bug #75477 [Opn]: last weekday of this month returns previous month when date is set

Edit report at https://bugs.php.net/bug.php?id=75477&edit=1 ID: 75477 User updated by: wouter at deinternetjongens dot nl Reported by: wouter at deinternetjongens dot nl Summary: last weekday of this month returns previous month when date is set Status: Open Type: Bug Package: Date/time related Operating System: Linux, mac os PHP Version: 7.1.11 Block user comment: N Private report: N New Comment: Expected result should be : ---------------- DateTime {#12086 +"date": "2017-12-29 00:00:00.000000", +"timezone_type": 3, +"timezone": "UTC", } Previous Comments: ------------------------------------------------------------------------ [2017-11-03 10:38:31] wouter at deinternetjongens dot nl Description: ------------ We came across a bug when trying to get the last weekday of a month. When we first setted a new date and afterwards modified it to get the last weekday of that month it returns the last weekday of the month before the month given. Test script: --------------- $datetime = new DateTime()->setDate(2017, 12, 1); var_dump($datetime->modify('last weekday this month'); Expected result: ---------------- DateTime {#12086 +"date": "2017-12-30 00:00:00.000000", +"timezone_type": 3, +"timezone": "UTC", } Actual result: -------------- DateTime {#12086 +"date": "2017-11-30 00:00:00.000000", +"timezone_type": 3, +"timezone": "UTC", } ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=75477&edit=1