How to select all values with latest dates Laravel 5.8

I am trying to get all of the rows with the latest dates

Assuming I have 5 records:

1 | 2019-09-13

2 | 2019-09-13

3 | 2019-09-14

4 | 2019-09-14

5 | 2019-09-14

When I use this eloquent query:

    $items = Purchase::whereYear('created_at', '=', $year)
          ->whereMonth('created_at', '=', $month)
          ->where('created_at', Purchase::max('created_at'))
          ->get();
    return $items;

It only returns only 1 record, and that is record #5.

I want to get the records 3, 4 , and 5. What's wrong with my query?

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