Description:
------------
When trying to set the time zone EET, we got offset +2 but expext +3.
The bug is in all versions since 5.5.10.

http://3v4l.org/0M1S9#v542

Test script:
---------------
<?php
date_default_timezone_set('EET');
$date = new DateTime();
var_dump($date);
$date->setTimezone(new DateTimeZone('EET'));
var_dump($date);

Expected result:
----------------
 object(DateTime)#1 (3) {
  ["date"]=>
  string(19) "2014-04-09 12:23:44"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(3) "EET"
}
object(DateTime)#1 (3) {
  ["date"]=>
  string(19) "2014-04-09 12:23:44"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(3) "EET"
}

Actual result:
--------------
 object(DateTime)#1 (3) {
  ["date"]=>
  string(19) "2014-04-09 12:23:44"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(3) "EET"
}
object(DateTime)#1 (3) {
  ["date"]=>
  string(19) "2014-04-09 11:23:44"
  ["timezone_type"]=>
  int(2)
  ["timezone"]=>
  string(3) "EET"
}