Date-Nut Cake Roll
["1 (8 oz.) pkg. whole, pitted dates, chopped", "1 c. water", "1/4 c. sugar", "1 c. all-purpose flour", "1 tsp. baking powder", "1/2 tsp. ground allspice", "dash of salt", "additional nuts", "3/4 c. finely chopped nuts", "1 to 2 Tbsp. powdered sugar", "2 (3 oz.) pkg. cream cheese, softened", "1/4 c. margarine, softened", "1 tsp. vanilla extract", "1 c. sifted powdered sugar", "1 Tbsp. powdered sugar"]
["Grease and flour the bottom and sides of a 15 x 10 x 1-inch jellyroll pan; set aside."]
["dates", "water", "sugar", "flour", "baking powder", "ground allspice", "salt", "nuts", "nuts", "powdered sugar", "cream cheese", "margarine", "vanilla extract", "powdered sugar", "powdered sugar"]