"New" Badge for Recent Posts

<?php
add_filter( 'the_title', 'scseed_new_badge_on_recent_posts', 10, 2 );
if ( ! function_exists( 'scseed_new_badge_on_recent_posts' ) ) {
    function scseed_new_badge_on_recent_posts( $title, $post_id ) {
        if ( is_admin() ) {
            return $title;
        }
        if ( ! is_archive() && ! is_home() && ! is_search() ) {
            return $title;
        }
        $days_threshold = 7;
        $post_date  = get_post_field( 'post_date', $post_id );
        $days_old   = ( time() - strtotime( $post_date ) ) / DAY_IN_SECONDS;
        if ( $days_old <= $days_threshold ) {
            $title .= ' <span class="scseed-new-badge" aria-label="'
                . esc_attr__( 'New', 'scseed' ) . '">'
                . esc_html__( 'New', 'scseed' ) . '</span>';
        }
        return $title;
    }
}