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Bug #66257 strtotime doesn't use current timezone on '4 thursdays'
Submitted: 2013-12-10 18:09 UTC Modified: 2015-04-29 20:05 UTC
From: mfaust at usiwireless dot com Assigned: derick (profile)
Status: Assigned Package: Date/time related
PHP Version: 5.6.8 OS: Linux
Private report: No CVE-ID: None
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 [2013-12-10 18:09 UTC] mfaust at usiwireless dot com
Description:
------------
---
From manual page: http://www.php.net/function.strtotime
---
date_default_timezone_set('UTC');
$timestamp = mktime(0,0,0,11,1,2014);

strtotime('4 thursdays', $timestamp) does not return the same timestamp as strtotime('first thursday + 3 weeks', $timestamp)

The first call returns a timestamp indicating a time of 6am (we are in CST) and the second returns a timestamp indicating 12am.

Test script:
---------------
//The server timezone is America/Chicago
$timestamp = mktime(0,0,0,11,1,2014);
echo strtotime('4 thursdays', $timestamp) . "\n";
strtotime('first thursday + 3 weeks', $timestamp) . "\n";

Expected result:
----------------
Both should return the same timestamp indicating 12:00 am.


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 [2013-12-10 18:30 UTC] derick@php.net
-Status: Open +Status: Feedback
 [2013-12-10 18:30 UTC] derick@php.net
Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc. If the script requires a 
database to demonstrate the issue, please make sure it creates 
all necessary tables, stored procedures etc.

Please avoid embedding huge scripts into the report.

The following works just fine here:
<?php
date_default_timezone_set("America/Chicago");
$timestamp = mktime(0,0,0,11,1,2014);
$a = strtotime('4 thursdays', $timestamp);
$b = strtotime('first thursday + 3 weeks', $timestamp);

echo date(DateTime::ISO8601, $a), "\n";
echo date(DateTime::ISO8601, $b), "\n";
?>

outputs:
2014-11-27T00:00:00-0600
2014-11-27T00:00:00-0600


This is with PHP 5.4.24
 [2014-12-30 10:42 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 [2014-12-30 16:49 UTC] mfaust at usiwireless dot com
This still occurs on PHP 5.6.4

<?php
echo date_default_timezone_get() . "\n;
date_default_timezone_set('UTC');
$timestamp = mktime(0,0,0,11,1,2014);
echo strtotime('4 thursdays', $timestamp) . "\n";
echo strtotime('first thursday + 3 weeks', $timestamp) . "\n";
?>

Output:
America/Chicago
1417068000
1417046400
 [2014-12-30 16:52 UTC] mfaust at usiwireless dot com
I am unable to change the status back to "unopened" due to "ERROR:
You aren't allowed to change a bug to that state."
 [2014-12-30 16:52 UTC] mfaust at usiwireless dot com
sorry, I meant "re-opened"
 [2014-12-30 18:54 UTC] requinix@php.net
-Status: No Feedback +Status: Open
 [2015-04-29 19:58 UTC] cmb@php.net
-Status: Open +Status: Verified
 [2015-04-29 19:58 UTC] cmb@php.net
Interestingly, the issue is timezone related. It doesn't happen for
America/Chicago, but for UTC, for instance[1].

[1] <http://3v4l.org/LLkCE>
 [2015-04-29 19:59 UTC] cmb@php.net
-PHP Version: 5.4.22 +PHP Version: 5.6.8
 [2015-04-29 20:05 UTC] derick@php.net
-Status: Verified +Status: Assigned -Assigned To: +Assigned To: derick
 
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