Combine dates, sugar and 1 teaspoon vanilla, and hot water in a medium saucepan. Cook over medium heat until thickened - about 6 - 8 minutes. Stir constantly. Remove from heat and stir in pecans. Set date mixture aside to cool. Combine brown sugar and butter. Cream until light and fluffy. Beat in eggs. Combine flour, soda, cream of tartar, salt and cinnamon. Stir into creamed mixture. Add 1 teaspoon vanilla and mix well. Divide dough into thirds. Roll each portion into a 12" square on waxed paper. Spread with 1/3 of date mixture. Lifting up edge of waxed paper, gently peel off dough and roll jelly roll fashion. Wrap rolls in waxed paper and refrigerate overnight. Cut dough into 1/4" slices and place two inches apart on greased cookie sheet. Bake at 350 degrees for 8 - 10 minutes. Cool cookies on wire rack.