<input type="date" id="expiry_date" class="form-control @error('expiry_date') is-invalid @enderror" name="expiry_date" value="{{ old('expiry_date') }}" required autocomplete="expiry_date">

public function import()
{
    Excel::import(new excel_import(), storage_path('excel_file.xlsx'));
    return redirect()->route('index');
}

public function model(array $row)
{
    try
    {
        $date = Carbon::createFromFormat("d.m.Y", $row[5])->format('Y-m-d');
        //$timestamp = strtotime($row[5]);
        //$date = date("Y-m-d", $timestamp);
        return new Item([
            'user'       => $row[0],
            'name'       => $row[1],
            'expiry_date'        => $date,

        ]);
    }
    catch(Throwable $t){
        return null;
    }
}

public $casts = ['expiry_date' => 'date:Y-m-d',];
 public $dates = ['expiry_date',];

$table->date('expiry_date')->nullable();