Query records from the last 7 days

Today is 2/24/2022

On my report page, I read interval from the query params, and this is what I have in my controller:

$inputs    = Request::all();
$interval  = 'week'; // <<------------ Default Value 

if(array_key_exists('interval', $inputs)){
    $interval  = $inputs['interval'];
}


switch ($interval) {
    case 'day':
    $q = BabyLog::where('updated_at', '>', now()->today());
    break;
    case 'week':
    $q = BabyLog::where('updated_at', '>', now()->subWeek());
    break;
    case 'month':
    $q = BabyLog::where('updated_at', '>', now()->subMonth());
    break;
    case 'year':
    $q = BabyLog::where('updated_at', '>', now()->subYear());
    break;
    default:
    $q = BabyLog::orderBy('updated_at', 'desc');
    break;
}




$logs = $q->where('babyId',$baby->id)->orderBy('updated_at', 'desc')->get()->groupBy(function ($log) {
    return $log->updated_at->format('Y-m-d');
});

dd($logs);

return

Illuminate\Database\Eloquent\Collection {#344 ▼
  #items: array:8 [▼
    "2022-02-24" => Illuminate\Database\Eloquent\Collection {#352 ▶}
    "2022-02-23" => Illuminate\Database\Eloquent\Collection {#353 ▶}
    "2022-02-22" => Illuminate\Database\Eloquent\Collection {#351 ▶}
    "2022-02-21" => Illuminate\Database\Eloquent\Collection {#349 ▶}
    "2022-02-20" => Illuminate\Database\Eloquent\Collection {#350 ▶}
    "2022-02-19" => Illuminate\Database\Eloquent\Collection {#348 ▶}
    "2022-02-18" => Illuminate\Database\Eloquent\Collection {#346 ▶}
    "2022-02-17" => Illuminate\Database\Eloquent\Collection {#345 ▶}
  ]
}

I only want to display the last 7 days on my graph.

1. Why does 2022-02-17 is also on the list ??

2. What did I do wrong on the above codes?

3. Does subWeek() always return 8 ?

4. Should I just do subWeek() -1 ?

But ... subMonth(), and subYear() I don't have to do it.

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