How does GetSellerList filter Stores Items when using the End-Time filters?

GetSellerList will filter on the EndTime of Stores Items. All Stores listings do have an EndTime which is obtainable via GetItem. GTC items essentially renew every 30 days and therefore the end-time is initially start time + 30 days. The end-time will be bumped by 30 days when the item is automatically renewed (relisted).