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<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

function wordpress_modified_date_shortcode() {

    return get_the_modified_date(); 
}
add_shortcode( 'modified_date', 'wordpress_modified_date_shortcode' );

add_filter( 'genesis_post_info', 'add_modified_date_post_info' );
function add_modified_date_post_info($post_info) {
    $post_info = 'Updated: [modified_date] by [post_author_posts_link] [post_comments] [post_edit]';
    return $post_info;
}