How to convert date with specific timezone when retrieving data?

I want to convert my created_at date, i do something like this but got error

 Model::whereDate(DB::raw("(CONVERT_TZ(created_at, +5:00, +8:00))"), '=>', $start)->whereDate(DB::raw("(CONVERT_TZ(created_at, +5:00, +8:00))"), '<=', $end)......
        

I tried but i gave me error, is there anyway can convert timezone using eloquent model?