Yes there is a way to sort though your wishlist by the date you added them. It's that button at the upper left marked "Sort By" The bottom choice is "Newest to oldest". What it isn't possible to do is sort them by the date the item was added to the catalog rather than to your wishlist. It is also possible to filter for only sale items. If you use both, you get the items you added last which are on sale at the top.