public function setCreatedRange($createdRange)
    {
        if ($createdRange instanceof DateTimeRange) {
            $this->createdRange = $createdRange;
        } elseif (is_array($createdRange)) {
            $this->createdRange = new DateTimeRange($createdRange);
        } else {
            $this->createdRange = null;
            trigger_error('Argument must be an object of class DateTimeRange. Data loss!', E_USER_WARNING);
        }

        return $this;
    }