last modified date

Hi.

i've seen a lot of discussion on this and tried similar to the discussion under "https://generatepress.com/forums/topic/displaying-last-updated-date-time-on-posts/"

I used the code in my functions.php

function wpb_last_updated_date( $content ) {
$u_time = get_the_time('U');
$u_modified_time = get_the_modified_time('U');
if ($u_modified_time >= $u_time + 86400) {
$updated_date = get_the_modified_time('F jS, Y');
$updated_time = get_the_modified_time('h:i a');
$custom_content .= '<p class="last-updated">Last updated on '. $updated_date . ' at '. $updated_time .'</p>';
}

$custom_content .= $content;
return $custom_content;
}
add_filter( 'the_content', 'wpb_last_updated_date' );

added this css
.last-updated {
font-size: small;
text-transform: uppercase;
background-color: #efefef;
}

It does work, but i didn't want to modify any of the pages.

Somehow i missed the part on how to control where this shows. I only wanted it on the posts. I want no date on my pages as they are static.

I'm sure you've answered this I'm just not locating the correct sequence of information.

Thanks. Martha