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WooCommerce REST API v3 – Filter products by modified date

Solution:

After several hours of meddling with different documentation and APIs, here’s the solution that worked for me.

add_filter('woocommerce_rest_product_object_query', function(array $args, \WP_REST_Request $request) {
    $modified_after = $request->get_param('modified_after');

    if (!$modified_after) {
        return $args;
    }

    $args['date_query'][0]['column'] = 'post_modified';
    $args['date_query'][0]['after']  = $modified_after;

    return $args;

}, 10, 2);

It’s to be noted that this is for version v3 (latest when this answer is written) and it may or may not work for the previous versions.