Description:
------------
I'm loading a DateTime object by a UNIX timestamp.

I assumed it would use the local timezone configured (e.g. date() behavior) but it defaults to UTC.

When passing a DateTimeZone object into the third parameter of DateTime::createFromFormat, it does nothing.

Setting the timezone using DateTime::setTimezone after the DateTime object has loaded gives the correct result.

See examples.

Test script:
---------------
<?php

$time = 1293800400;
$tz = new DateTimeZone('Australia/Sydney');

// assumes local timezone
var_dump(date('r', $time));

// sets to "+00:00", should assume local timezone
var_dump(DateTime::createFromFormat('U', $time));

// sets to "+00:00", ignores given DateTimeZone object
var_dump(DateTime::createFromFormat('U', $time, $tz));  

// adjusts to given timezone correctly
var_dump(DateTime::createFromFormat('U', $time)->setTimezone($tz));

Expected result:
----------------
string(31) "Sat, 01 Jan 2011 00:00:00 +1100"

object(DateTime)#2 (3) {
  ["date"]=>
  string(19) "2011-01-01 00:00:00"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Australia/Sydney"
}

object(DateTime)#2 (3) {
  ["date"]=>
  string(19) "2011-01-01 00:00:00"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Australia/Sydney"
}

object(DateTime)#2 (3) {
  ["date"]=>
  string(19) "2011-01-01 00:00:00"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Australia/Sydney"
}

Actual result:
--------------
string(31) "Sat, 01 Jan 2011 00:00:00 +1100"

object(DateTime)#2 (3) {
  ["date"]=>
  string(19) "2010-12-31 13:00:00"
  ["timezone_type"]=>
  int(1)
  ["timezone"]=>
  string(6) "+00:00"
}

object(DateTime)#2 (3) {
  ["date"]=>
  string(19) "2010-12-31 13:00:00"
  ["timezone_type"]=>
  int(1)
  ["timezone"]=>
  string(6) "+00:00"
}

object(DateTime)#2 (3) {
  ["date"]=>
  string(19) "2011-01-01 00:00:00"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Australia/Sydney"
}