/**
* @param Activity $activity
*/
public function add(Activity $activity)
{
$day = $activity->dateTime()->format('Y-m-d');
if (empty($this->list[$day]) || !$this->list[$day] instanceof Activity) {
$this->list[$day] = $activity;
return;
}
$this->list[$day]->increaseActivity($activity->activity());
}
