Jetpack Related Posts, filter by date

functions.php

function jetpackme_related_posts_past_halfyear_only( $date_range ) {
    $date_range = array(
        'from' => strtotime( '-6 months' ),
        'to' => time(),
    );
    return $date_range;
}
add_filter( 'jetpack_relatedposts_filter_date_range', 'jetpackme_related_posts_past_halfyear_only' );