Exclude post by certain number day.

You can use the new filter, gtc_should_display_item to filter out the posts you want (based on any metric).

e.g.

function gtc_remove_unless_older( $show, $item, $atts ) {
	if ( isset( $item['post']->post_date ) ) {
		$post_time_stamp = strtotime( $item['post']->post_date );
		$week_ago = time() - ( DAY_IN_SECONDS * 7 );

		// Only show if the post time stamp is older than a week ago.
		$show = $post_time_stamp < $week_ago;
	}

	return $show;
}
add_filter( 'gtc_should_display_item', 'gtc_remove_unless_older', 10, 3 );