/**
  * Queue date-based emails
  * @param WC_Order $order
  * @return array
  */
 public function queue_date_emails($order)
 {
     $queued = array();
     $triggers = $this->get_order_triggers($order);
     $emails = fue_get_emails('any', FUE_Email::STATUS_ACTIVE, array('meta_query' => array(array('key' => '_interval_type', 'value' => 'date'))));
     foreach ($emails as $email) {
         // skip date emails that have passed
         if (FUE_Sending_Scheduler::send_date_passed($email->id)) {
             continue;
         }
         $insert = array('send_on' => $email->get_send_timestamp(), 'email_id' => $email->id, 'product_id' => $email->product_id, 'order_id' => $order->id);
         if (!is_wp_error(FUE_Sending_Scheduler::queue_email($insert, $email))) {
             $queued[] = $insert;
         }
     }
     return $queued;
 }