Bug #51557 [Opn]: timelib_timezone_lookup has invalid DST entries, breaks strtotime

Edit report at http://bugs.php.net/bug.php?id=51557&edit=1

 ID:               51557
 User updated by:  a3297627 at owlpic dot com
 Reported by:      a3297627 at owlpic dot com
 Summary:          timelib_timezone_lookup has invalid DST entries,
                   breaks strtotime
 Status:           Open
 Type:             Bug
 Package:          Date/time related
 Operating System: Linux
 PHP Version:      5.2.13

 New Comment:

Copy/paste error, the test output should read:

Expected result:

Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 1:00pm KST
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 1:00pm KST
Input: Thu, 15 Apr 2010 05:00:00 +0000
Converted: Thursday, Apr 15 12:00am EDT
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 12:00am EDT

Actual Result:
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 1:00pm KST
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 1:00pm KST
Input: Thu, 15 Apr 2010 05:00:00 +0000
Converted: Thursday, Apr 15 1:00am EDT
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 12:00am EDT


Previous Comments:
------------------------------------------------------------------------
[2010-04-15 06:17:07] a3297627 at owlpic dot com

Description:
------------
It seems timezonemap.h was generated by a tzdata parser that
unfortunately did not include information on the years Daylight Saving
Time was in use. In particular, in South Korea, there is no DST, yet
there exists KST/KDT distinction in strtotime that thinks KDT is
currently active, with inconsistencies with other date/time functions.

Test script:
---------------
<?php
function tzconvert ($input, $timezone)
{
        $ts = strtotime ($input);
        $time = gmdate ('r', $ts);
        $dt = new DateTime ($time);
        $dt->setTimeZone (new DateTimeZone ($timezone));
        echo "Input: $time\nConverted: " . $dt->format ('l, M d g:ia T')
. "\n";
}

tzconvert ("Thursday, April 15 2010 12:00am EDT", "KST");
tzconvert ("Thursday, April 15 2010 12:00am EDT", "KDT");

tzconvert ("Thursday, Apr 15 1:00pm KST", "EDT");
tzconvert ("Thursday, Apr 15 1:00pm KDT", "EDT");
?>


Expected result:
----------------
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 1:00pm KST
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 1:00pm KST
Input: Thu, 15 Apr 2010 05:00:00 +0000
Converted: Thursday, Apr 15 1:00am EDT
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 12:00am EDT


Actual result:
--------------
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 1:00pm KST
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 1:00pm KST
Input: Thu, 15 Apr 2010 05:00:00 +0000
Converted: Thursday, Apr 15 1:00am EDT
Input: Thu, 15 Apr 2010 04:00:00 +0000
Converted: Thursday, Apr 15 1:00am EDT



------------------------------------------------------------------------



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