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Bug #63927 Bogus week number with date + strtotime
Submitted: 2013-01-07 09:06 UTC Modified: 2013-01-07 10:37 UTC
From: tcheko at no-log dot org Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 5.4.10 OS: Linux
Private report: No CVE-ID: None
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From: tcheko at no-log dot org
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 [2013-01-07 09:06 UTC] tcheko at no-log dot org 
Description:
------------
the test script returns date formated as year+week.

It should return a list of date like this:

...
201250
201251
201252
201301
201302
...

NB: increase $i if current weeknumber is greater than 14 to expose the bug.

Test script:
---------------
<?php
for($i = 15; $i >= 0; $i--) echo date("YW", strtotime("-$i week")) . "<br />";
?>


Expected result:
----------------
...
201250
201251
201252
201301
201302
...

Actual result:
--------------
...
201250
201251
201252
**201201**
201302
...

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 [2013-01-07 09:22 UTC] rasmus@php.net
-Status: Open +Status: Not a bug
 [2013-01-07 09:22 UTC] rasmus@php.net 
There is no bug here. This is correct as per the ISO-8601 Date spec. The first 
week of the year is the week that contains the first Thursday. And weeks always 
start on Mondays. That means the first day of the first week is not always in the 
same calendar year as the first Thursday. Please read the ISO-8601 spec for more 
details.
 [2013-01-07 10:37 UTC] tcheko at no-log dot org 
Replace Y with o for expected year. 

Definitly subtle, misleading and brain damaged.

for($i = 15; $i >= 0; $i--) echo date("oW", strtotime("-$i week")) . "<br />";
 
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