Description:
------------

When you run the script method format returns different date than was reported in the __construct

Test script:
---------------
1º Case
<?php
date_default_timezone_set('America/Sao_Paulo');
$date = new \DateTime('01/02/2016');
var_dump($date->format('d/m/Y'));
?>

2º Case
<?php
date_default_timezone_set('America/Sao_Paulo');
$date = new \DateTime('01/02/2016');
var_dump($date);
?>

Expected result:
----------------
1º Case
string(10) "01/02/2016"

2º Case
class DateTime#1 (3) {
  public $date =>
  string(26) "2016-02-01 00:00:00.000000"
  public $timezone_type =>
  int(3)
  public $timezone =>
  string(17) "America/Sao_Paulo"
}

Actual result:
--------------
1º Case
02/01/2016

2º Case

Displays the following result
class DateTime#1 (3) {
  public $date =>
  string(26) "2016-01-02 00:00:00.000000"
  public $timezone_type =>
  int(3)
  public $timezone =>
  string(17) "America/Sao_Paulo"
}