Description:
------------
setDate, setISODate, setTime works wrong

Test script:
---------------
$tz = 'UTC';
date_default_timezone_set($tz);

$ts = strtotime('2006-01-01');
$dt = new DateTime('@'.$ts);
$dt->setTimezone(new DateTimeZone($tz));

echo $dt->format('o-\WW-N | Y-m-d | H:i:s | U'), "\n";

$dt->setISODate(2005, 52, 1);
echo $dt->format('o-\WW-N | Y-m-d | H:i:s | U'), "\n";

$dt->setDate(2007, 10, 10);
echo $dt->format('o-\WW-N | Y-m-d | H:i:s | U'), "\n";

$dt->setTime(20, 30, 40);
echo $dt->format('o-\WW-N | Y-m-d | H:i:s | U'), "\n";


Expected result:
----------------
2005-W52-7 | 2006-01-01 | 00:00:00
2005-W52-1 | 2005-12-26 | 00:00:00
2007-W40-5 | 2007-10-10 | 00:00:00
2007-W40-5 | 2007-10-10 | 20:30:40


Actual result:
--------------
2005-W52-7 | 2006-01-01 | 00:00:00 | 1136073600
2041-W52-4 | 2041-12-26 | 00:00:00 | 2271628800
2044-W40-1 | 2044-10-03 | 00:00:00 | 2359065600
2081-W39-6 | 2081-09-27 | 20:30:40 | 3526230640