/**
  * Return a collection off 1 month ago based on the username supplied
  *
  * @param string $username
  * @return ActivityDayCollection
  */
 private function getCollectionByUsername($username)
 {
     $created = new \DateTime("-1 month");
     $data = $this->repository->findAfterCreatedByUsername($created, $username);
     $collection = new ActivityDayCollection();
     foreach ($data as $activityUsage) {
         $collection->add($activityUsage);
     }
     return $collection;
 }