month.php

<?php

add_action('init', function () {

    $orders = wc_get_orders([
        'date_created' => '2020-11-01...2020-11-30',
        'limit' => 50000,
    ]);
    
    $order = wc_get_order(16118)->get_items();
    
    echo '<pre>';
    foreach ($items as $item) {
        echo $item->get_product_id();
    }
    exit;
    
});

week.php

<?php

add_action('init', function () {

    $orders = wc_get_orders([
        'date_created' => '2020-11-23...2020-11-30',
        'limit' => 50000,
    ]);
    
    $order = wc_get_order(16118)->get_items();
    echo '<pre>';
    foreach ($items as $item) {
        echo $item->get_product_id();
    }
    exit;
});