How to use a where() inside a when() correctly to get dates

Hi All, I am trying to return events that are within the last 30 days. I am using the code

public function fetch(Request $request)
    {
        return Event::whereIn('status',['p', 'e'])
            ->with('user','clicks','category', 'location', 'remotelocations', 'organizer', 'shows', 'curatedCheck')
            ->when(request('date') === 'published', function ($q) {
                $q->orderByDesc('published_at');
            })
            ->when(request('date') === 'updated', function ($q) {
                $q->orderByDesc('updated_at');
            })
            ->when(request('date') === 'twoweeks', function ($q) {
                $q->where(
                    'closingDate','>=', Carbon::now()->subDays(30)->toDateTimeString()
                );
            })
            ->paginate(15);
    }

However when I make request(date) = to twoweeks nothing is filtered. I am loading Carbon into my controller.