Laravel whereBetween and Exporting result to CSV

I'm using Matt Stauffer CSV export package. Using Reporting::all() I get the expected result and the CSV report is downlooaded successfully. But using the below code I only get empty result. Just the csv file with columns, not a single row.

public function export($from, $to)
    {
        $reports = Reporting::whereBetween('reportDate',[date('m-d-Y', $from), date('m-d-Y', $to)]);

        $csv = \League\Csv\Writer::createFromFileObject(new \SplTempFileObject());

        $csv->insertOne(\Schema::getColumnListing('reports'));

        foreach ($reports as $rep) {
            $csv->insertOne($rep->toArray());
        }

        //return \Response::download($csv->output('reports.csv'));
        return $csv->output('reports.csv');
    }

Is there anything wrong I'm doing in the whereBetween condition?

via Chebli Mohamed