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Last Modified Dates in the XML Sitemap

Adds the date each post was last updated to the built-in sitemap, which helps search engines find changed content faster.

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Code

add_filter( 'wp_sitemaps_posts_entry', function ( $entry, $post ) {
    $entry['lastmod'] = get_post_modified_time( 'c', true, $post );

    return $entry;
}, 10, 2 );

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