[PHP-BUG] Bug #51557 [NEW]: timelib_timezone_lookup has invalid DST entries, breaks strtotime

From:             
Operating system: Linux
PHP version:      5.2.13
Package:          Date/time related
Bug Type:         Bug
Bug description:timelib_timezone_lookup has invalid DST entries, breaks strtotime

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


-- 
Edit bug report at http://bugs.php.net/bug.php?id=51557&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=51557&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=51557&r=trysnapshot53
Try a snapshot (PHP 6.0):            http://bugs.php.net/fix.php?id=51557&r=trysnapshot60
Fixed in SVN:                        http://bugs.php.net/fix.php?id=51557&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=51557&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=51557&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=51557&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=51557&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=51557&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=51557&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=51557&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=51557&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=51557&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=51557&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=51557&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=51557&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=51557&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=51557&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=51557&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=51557&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=51557&r=mysqlcfg