$period = new DatePeriod(
                new DateTime( '2024-03-20 00:00:00' ),
                new DateInterval('P1D'),
                new DateTime( '2024-03-28 23:59:59' )
            );
            $orders = OrderProduct::where ('brand','<>','NULL');
            foreach ($period as $date){
                $labels[] = $date->format('d-m-Y'); 
                $searchDate = $date->format('Y-m-d');  **//This doesn't work**
                //$searchDate = '2024-03-26';          **//This works**
                $order = $orders->whereDate( 'updated_at','=',$searchDate )->get();
                foreach ($order as $item){
                    if( $item ){
                        Log::info( $item->brand );
                    }
                }
            }

As you see when I try //This works line. It works but when I use code like above it doesn’t work. I have checked $searchDate with gettype() and it shows string. My database postgresql and updated_at field like = 2024-03-26 09:17:01