Description:
------------
setTime() causes time to move to next Sunday if modify() was called before it. See example. Looks related to Bug #39782
Tested on 5.2.2 Windows & 5.2.3 Linux

Reproduce code:
---------------
date_default_timezone_set('Europe/London');

$start = new DateTime('last Monday');
echo $start->format('Y-m-d H:i:s'),PHP_EOL;
//good

$start->modify('Tuesday');
echo $start->format('Y-m-d H:i:s'),PHP_EOL;
//good

$start->setTime(0, 0, 0);
echo $start->format('Y-m-d H:i:s'),PHP_EOL;
//jumped to next Sunday

$start->setTime(0, 0, 0);
echo $start->format('Y-m-d H:i:s'),PHP_EOL;
//jumped to next Sunday again

Expected result:
----------------
2007-06-04 00:00:00
2007-06-05 00:00:00
2007-06-05 00:00:00
2007-06-05 00:00:00

Actual result:
--------------
2007-06-04 00:00:00
2007-06-05 00:00:00
2007-06-10 00:00:00
2007-06-17 00:00:00