public function getCleanInterval()
    {
        if (!$this->cleanInterval instanceof DateInterval) {
            $this->cleanInterval = new DateInterval($this->cleanInterval);
        }
        return $this->cleanInterval;
    }
public function getCleanInterval()
    {
        if (!$this->cleanInterval instanceof DateInterval) {
            $this->cleanInterval = new DateInterval($this->cleanInterval);
        }
        return $this->cleanInterval;
    }
public function getCleanInterval ( ) { if ( ! $ this -> cleanInterval instanceof DateInterval ) { $ this -> cleanInterval = new DateInterval ( $ this -> cleanInterval ) ; } return $ this -> cleanInterval ; }
Get clean interval

@return \Spork\DateTime\DateInterval
Get clean interval