How to format non-native date picker state

DatePicker::make('startDateParam')
                        ->label(__('Start date'))
                        ->native(false)
                        ->weekStartsOnMonday()
                        ->displayFormat('d-m-Y')
                        ->closeOnDateSelection()
                        ->beforeStateUpdated(fn (null|string $state) => filled($state) ? Carbon::parse($state)->startOfWeek()->toDateString() : null)
                        ->afterStateUpdated(function ($state) {
                            if (filled($state)) {
                                $this->startDate = Carbon::parse($state)->startOfWeek();
                                $this->startDateParam = $this->startDate->toDateString();
                                $this->week = $this->startDate->isoWeek;
                            }
                        })
                        ->extraAttributes(['class' => 'z-10']),