Thank you! The removing of the filter must have been the important step keeping what I had previously from working. I used the below filter to return every custom post type older than a year.
/*Function to filter out post less than a year old */
function filter_where($where = '') {
$today = date('Y-m-d');
$newdate = strtotime ( '-1 year' , strtotime ( $today ) ) ;
$ayearago = date( 'Y-m-d' , $newdate );
$where .= " AND post_date <= DATE('{$ayearago}')";
return $where;
}
Plugin works great, but an internationalization feature (choose your language) would greatly expand the use of this plugin. Thanks for your work.