To prepare filling, mix together dates, sugar and water in saucepan and cook over low heat, stirring constantly, until thickened (about 10 minutes). Allow to cool. Add pecans.
Preheat oven to 400 degrees. Cream butter and brown sugar. Combine remaining ingredients and stir into butter mixture until well blended. Press half of the filling into a 9x13-inch glass baking dish. Spread with cooled filling. Cover with remaining filling mixture, patting lightly. Bake until lightly browned (approximately 25 to 30 minutes). Cool and cut into bars.