Published and Updated date at the bottom of the content

Hi there,

Are you referring to single posts here?

If so activate it in the customizer:
https://docs.generatepress.com/article/blog-content-layout/#single

And move it to the bottom with this PHP snippet:

add_filter( 'generate_footer_entry_meta_items ', function( $items ) {
    if ( is_single() ) {
        $items = array(
            'date',
        );
    } return $items;
} );

Adding PHP: https://docs.generatepress.com/article/adding-php/

Reference: https://docs.generatepress.com/article/generate_footer_entry_meta_items/

Then use this CSS solution:
https://docs.generatepress.com/article/show-the-updated-post-date/

Adding CSS: https://docs.generatepress.com/article/adding-css/

I would like a similar message -

This post was published on <published date> and has been modified on <updated date>.

How can I do this.

I'm not sure whether the above code does it in single line.

Can you apply the solution above first and we can tweak it from there?