#33957 [NEW]: gmdate('W')/date('W') sometimes returns wrong week number.

From: Date: Tue, 02 Aug 2005 01:27:52 +0000
Subject: #33957 [NEW]: gmdate('W')/date('W') sometimes returns wrong week number.
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-82789@lists.php.net to get a copy of this message 
From:             paul at stunning-stuff dot com
Operating system: Windows XP Pro
PHP version:      5.1.0b3
PHP Bug Type:     Date/time related
Bug description:  gmdate('W')/date('W') sometimes returns wrong week number.

Description:
------------
Hi,

While I was writing my own getWeekNumber method I discovered gmdate('W')
and date('W') both return incorrect results for the year 1992 and 2020.
Both years end on a thursday and both are leap years. I'm guessing that
this is exactly the reason they return incorrect results :).

Expected result:
The last 4 days in 1992 and 2020 belong to week 53 of those years
according to ISO 8601 rules.

Actual result:
gmdate('W') and date('W') think the last 4 days of 1992 and 2020 belong to
week 1 of the following year.

I only had the time to test these two years, but I expect that PHP will
return the incorrect week number for every leap year that ends with a
thursday.

Thanks,

Paul van der Maas
---
www.stunning-stuff.com


-- 
Edit bug report at http://bugs.php.net/?id=33957&edit=1
-- 
Try a CVS snapshot (php4):   http://bugs.php.net/fix.php?id=33957&r=trysnapshot4
Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=33957&r=trysnapshot50
Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=33957&r=trysnapshot51
Fixed in CVS:                http://bugs.php.net/fix.php?id=33957&r=fixedcvs
Fixed in release:            http://bugs.php.net/fix.php?id=33957&r=alreadyfixed
Need backtrace:              http://bugs.php.net/fix.php?id=33957&r=needtrace
Need Reproduce Script:       http://bugs.php.net/fix.php?id=33957&r=needscript
Try newer version:           http://bugs.php.net/fix.php?id=33957&r=oldversion
Not developer issue:         http://bugs.php.net/fix.php?id=33957&r=support
Expected behavior:           http://bugs.php.net/fix.php?id=33957&r=notwrong
Not enough info:             http://bugs.php.net/fix.php?id=33957&r=notenoughinfo
Submitted twice:             http://bugs.php.net/fix.php?id=33957&r=submittedtwice
register_globals:            http://bugs.php.net/fix.php?id=33957&r=globals
PHP 3 support discontinued:  http://bugs.php.net/fix.php?id=33957&r=php3
Daylight Savings:            http://bugs.php.net/fix.php?id=33957&r=dst
IIS Stability:               http://bugs.php.net/fix.php?id=33957&r=isapi
Install GNU Sed:             http://bugs.php.net/fix.php?id=33957&r=gnused
Floating point limitations:  http://bugs.php.net/fix.php?id=33957&r=float
No Zend Extensions:          http://bugs.php.net/fix.php?id=33957&r=nozend
MySQL Configuration Error:   http://bugs.php.net/fix.php?id=33957&r=mysqlcfg

Thread (11 messages)

« previous php.bugs (#82789) next »