@skynet : Download catch box pro child theme from the following link and add the following code to the functions.php file of your child theme.
function wpb_last_updated_date( $content ) {
$custom_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' );
Let me know if you have any further issues.
Regards,
Tikaram