protected function getDates()
    {
        $date = new \DateTime ( "now" );
        $date->setTimezone ( new \DateTimeZone ( "America/Sao_Paulo" ) );

        $final = $date->format ( "Y-m-d\TH:i:s" );

        $dateInterval = "P" . ( string ) $this->_days . "D";
        $date->sub ( new \DateInterval ( $dateInterval ) );
        $date->setTime ( 00, 00, 00 );
        $initial = $date->format ( "Y-m-d\TH:i:s" );

        return [
            'initial' => $initial,
            'final'   => $final
        ];
    }