Bug #74511 [Opn->Nab]: Cannot construct a \DateTime from a valid format ("Y-\WW")

Edit report at https://bugs.php.net/bug.php?id=74511&edit=1 ID: 74511 Updated by: requinix@php.net Reported by: jack dot peterson at gmail dot com Summary: Cannot construct a \DateTime from a valid format ("Y-\WW") -Status: Open +Status: Not a bug Type: Bug Package: Date/time related Operating System: Ubuntu 16.04 PHP Version: 7.1.4 Block user comment: N Private report: N New Comment: DateTime represents an actual date. What date would 2017-W01 represent? Previous Comments: ------------------------------------------------------------------------ [2017-04-28 17:49:53] jack dot peterson at gmail dot com Description: ------------ Given the format, 'Y-\WW', one should be able to construct a date such as 2017-W01 or 2017-W1 as a valid date where W is a number from 0-52 as documented for Date. The expected behavior here would be to create a valid date w/ the next least-significant values to be zeroed out. Current behavior is that one cannot construct a valid \DateTime from the requested format. Test script: --------------- public function testCanCreateDateFromFormat() { $format = 'Y-\WW'; $date = '2017-W01'; $obj = \DateTime::createFromFormat($format, $date); $this->assertInstanceOf(\DateTime::class, $obj); } testCanCreateDateFromFormat Failed asserting that false is an instance of class "DateTime". Expected result: ---------------- \DateTime::createFromFormat should return an instance of \DateTime Actual result: -------------- \DateTime::createFromFormat returns false in this scenario. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=74511&edit=1