Converting month `without leading zero` to `with leading zero` is giving wrong output.

```
foreach(range(1,12) as $iM){
   $date = DateTime::createFromFormat('n', $iM);
   $m=intval($date->format('m'));
   echo "[$iM, $m]";
}

```

**Outout:**

```
[1, 1][2, 3][3, 3][4, 5][5, 5][6, 7][7, 7][8, 8][9, 10][10, 10][11, 12][12, 12]

```