02In a separate bowl, mix together the flours, baking powder, baking soda and salt. Whisk the dry ingredients into the wet, just until no longer lumpy. Using a rubber spatula, fold the olive oil into the batter in 3 additions. Fold in the dates.03Pour the batter into the prepared pan and bake until it is golden brown and a cake tester inserted in the center comes out clean, 50 to 55 minutes. Let rest for 10 minutes before turning the cake out onto a rack to cool completely.04To serve as sandwiches, cut into 1/2-inch-thick slices and make sandwiches with a layer of cream cheese studded with grape halves. Freeze any remainder; the bread can be sliced while frozen.