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Bug #62185 strtotime() returns incorrect time around DST (America)
Submitted: 2012-05-29 23:07 UTC Modified: 2017-03-19 10:15 UTC
Votes:8
Avg. Score:4.2 ± 1.1
Reproduced:8 of 8 (100.0%)
Same Version:4 (50.0%)
Same OS:4 (50.0%)
From: omg00dness at yahoo dot com Assigned:
Status: Duplicate Package: Date/time related
PHP Version: 5.3.13 OS: Ubuntu
Private report: No CVE-ID: None
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From: omg00dness at yahoo dot com
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 [2012-05-29 23:07 UTC] omg00dness at yahoo dot com 
Description:
------------
For an American timezone (at least those that observe Daylight Savings Time), strtotime() is outputting incorrectly when adding a negative time string.

Example uses March 11, 2012 at 2:00am, where the local time jumps instead to 3:00am.

Test script:
---------------
<?php
date_default_timezone_set('America/Los_Angeles'); 
echo date("M j Y H:i:s I", strtotime("2012-03-11 5:00:00 -1 hour")) . "\n";
echo date("M j Y H:i:s I", strtotime("2012-03-11 4:00:00 -1 hour")) . "\n";
echo date("M j Y H:i:s I", strtotime("2012-03-11 3:00:00 -1 hour")) . "\n";
echo date("M j Y H:i:s I", strtotime("2012-03-11 3:01:00 -1 hour")) . "\n";
echo date("M j Y H:i:s I", strtotime("2012-03-11 2:59:00 -1 hour")) . "\n";
echo date("M j Y H:i:s I", strtotime("2012-03-11 1:00:00 +1 hour")) . "\n";
echo date("M j Y H:i:s I", strtotime("2012-03-11 0:00:00 +1 hour")) . "\n";
?>

Expected result:
----------------
Mar 11 2012 04:00:00 1
Mar 11 2012 03:00:00 1
Mar 11 2012 01:00:00 0
Mar 11 2012 01:01:00 0
Dec 31 1969 16:00:00 0 //Perhaps output false?
Mar 11 2012 03:00:00 1
Mar 11 2012 01:00:00 0

Actual result:
--------------
Mar 11 2012 04:00:00 1
Mar 11 2012 03:00:00 1
Mar 11 2012 03:00:00 1
Mar 11 2012 03:01:00 1
Mar 11 2012 01:59:00 0
Mar 11 2012 03:00:00 1
Mar 11 2012 01:00:00 0

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 [2012-05-30 03:16 UTC] riptide dot tempora at opinehub dot com 
Improved test script:

<?php
date_default_timezone_set('America/Los_Angeles'); 
echo strtotime("2012-03-11 5:00:00 -1 hour") . "\t";
echo date("M j Y H:i:s I", strtotime("2012-03-11 5:00:00 -1 hour")) . "\n";
echo strtotime("2012-03-11 4:00:00 -1 hour") . "\t";
echo date("M j Y H:i:s I", strtotime("2012-03-11 4:00:00 -1 hour")) . "\n";
echo strtotime("2012-03-11 3:00:00 -1 hour") . "\t";
echo date("M j Y H:i:s I", strtotime("2012-03-11 3:00:00 -1 hour")) . "\n";
echo strtotime("2012-03-11 3:01:00 -1 hour") . "\t";
echo date("M j Y H:i:s I", strtotime("2012-03-11 3:01:00 -1 hour")) . "\n";
echo strtotime("2012-03-11 2:59:00 -1 hour") . "\t";
echo date("M j Y H:i:s I", strtotime("2012-03-11 2:59:00 -1 hour")) . "\n";
echo strtotime("2012-03-11 1:00:00 +1 hour") . "\t";
echo date("M j Y H:i:s I", strtotime("2012-03-11 1:00:00 +1 hour")) . "\n";
echo strtotime("2012-03-11 0:00:00 +1 hour") . "\t";
echo date("M j Y H:i:s I", strtotime("2012-03-11 0:00:00 +1 hour")) . "\n";
?>

My server produced (PHP Version 5.3.13):
1331463600	Mar 11 2012 04:00:00 1
1331460000	Mar 11 2012 03:00:00 1
1331460000	Mar 11 2012 03:00:00 1
1331460060	Mar 11 2012 03:01:00 1
1331459940	Mar 11 2012 01:59:00 0
1331460000	Mar 11 2012 03:00:00 1
1331456400	Mar 11 2012 01:00:00 0

http://www.alpha7f.com/phpt/bug62185.php
 [2017-03-19 10:15 UTC] heiglandreas@php.net
-Status: Open +Status: Duplicate
 [2017-03-19 10:15 UTC] heiglandreas@php.net 
We're now tracking this in https://bugs.php.net/bug.php?id=74274
 
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