ID: 33957
Updated by: derick@php.net
Reported By: paul at stunning-stuff dot com
-Status: Assigned
+Status: Closed
Bug Type: Date/time related
Operating System: *
PHP Version: 5CVS-2005-08-02
Assigned To: derick
New Comment:
This bug has been fixed in CVS.
Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
Thank you for the report, and for helping us make PHP better.
Previous Comments:
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[2005-08-02 16:45:08] paul at stunning-stuff dot com
Thanks for your quick reply and thanks for doing such a great job on
PHP. You dev's really make this the best open source language today.
I hope you are able to solve this problem (I'm sure you will). One more
note though: This problem should reoccur every 28 years before and after
1992. This might help you in your testing.
Thanks,
Paul van der Maas
---
www.stunning-stuff.com
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[2005-08-02 16:22:09] derick@php.net
Indeed a bug, will have a look at it - thanks for the reproducable
case.
------------------------------------------------------------------------
[2005-08-02 16:19:09] paul at stunning-stuff dot com
Here is some example code to reproduce the problem:
<?php
$timestamp = gmmktime(12, 0, 0, 12, 28, 1992);
echo 'Week number for ' . gmdate('D M d, Y H:i:s', $timestamp) . ': '
.
gmdate('W', $timestamp) . '<br>';
$timestamp = gmmktime(12, 0, 0, 12, 29, 1992);
echo 'Week number for ' . gmdate('D M d, Y H:i:s', $timestamp) . ': '
.
gmdate('W', $timestamp) . '<br>';
$timestamp = gmmktime(12, 0, 0, 12, 30, 1992);
echo 'Week number for ' . gmdate('D M d, Y H:i:s', $timestamp) . ': '
.
gmdate('W', $timestamp) . '<br>';
$timestamp = gmmktime(12, 0, 0, 12, 31, 1992);
echo 'Week number for ' . gmdate('D M d, Y H:i:s', $timestamp) . ': '
.
gmdate('W', $timestamp) . '<br>';
$timestamp = gmmktime(12, 0, 0, 12, 28, 2020);
echo 'Week number for ' . gmdate('D M d, Y H:i:s', $timestamp) . ': '
.
gmdate('W', $timestamp) . '<br>';
$timestamp = gmmktime(12, 0, 0, 12, 29, 2020);
echo 'Week number for ' . gmdate('D M d, Y H:i:s', $timestamp) . ': '
.
gmdate('W', $timestamp) . '<br>';
$timestamp = gmmktime(12, 0, 0, 12, 30, 2020);
echo 'Week number for ' . gmdate('D M d, Y H:i:s', $timestamp) . ': '
.
gmdate('W', $timestamp) . '<br>';
$timestamp = gmmktime(12, 0, 0, 12, 31, 2020);
echo 'Week number for ' . gmdate('D M d, Y H:i:s', $timestamp) . ': '
.
gmdate('W', $timestamp) . '<br>';
?>
Expected result:
Week number for Mon Dec 28, 1992 12:00:00: 53
Week number for Tue Dec 29, 1992 12:00:00: 53
Week number for Wed Dec 30, 1992 12:00:00: 53
Week number for Thu Dec 31, 1992 12:00:00: 53
Week number for Mon Dec 28, 2020 12:00:00: 53
Week number for Tue Dec 29, 2020 12:00:00: 53
Week number for Wed Dec 30, 2020 12:00:00: 53
Week number for Thu Dec 31, 2020 12:00:00: 53
Actual result:
Week number for Mon Dec 28, 1992 12:00:00: 1
Week number for Tue Dec 29, 1992 12:00:00: 1
Week number for Wed Dec 30, 1992 12:00:00: 1
Week number for Thu Dec 31, 1992 12:00:00: 1
Week number for Mon Dec 28, 2020 12:00:00: 1
Week number for Tue Dec 29, 2020 12:00:00: 1
Week number for Wed Dec 30, 2020 12:00:00: 1
Week number for Thu Dec 31, 2020 12:00:00: 1
Check
http://www.timeanddate.com/calendar/custom.html?year=1992&month=12&typ=1&display=1&wno=1
and
http://www.timeanddate.com/calendar/custom.html?year=2020&month=12&typ=1&display=1&wno=1
to see these expected results confirmed.
Sorry for the bulky post, but this way there is no room for
misinterpretation.
Thanks,
Paul van der Maas
---
www.stunning-stuff.com
------------------------------------------------------------------------
[2005-08-02 03:27:51] paul at stunning-stuff dot com
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
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--
Edit this bug report at http://bugs.php.net/?id=33957&edit=1