How to add last modified to OpenCart 1.5 sitemap?

Question

Search Engine Optimization

Hello! I saw that there is no lastmod tag in the google_sitemap.php sitemap. How can it be added there? I didn’t find any plugins, the advice to add a date that is formed when creating a sitemap is not suitable:

$output .= '<lastmod>' . date('c',time()) . '</lastmod>';

In this form, what's the point of adding it. You need exactly the date of the last change of the product and category. So that search engines scan first of all exactly those links that have recently been updated. If anyone has solved this issue, please share. Thanks in advance.

Answer 1

Products and categories have a date_modified column.
They should be available in a loop:

$product['date_modified'] // в цикле вывода товаров
$result['date_modified'] // в цикле вывода категорий