Simmer dates in water for 5 minutes. Add vanilla and set aside. Mix oats, flour, baking soda and salt. Pour melted margarine over all and mix well. Add maple syrup to taste and until it forms a dough. Place 2/3 of the dough on baking sheet, flatten and press to form crust. Pour date sauce over top, then sprinkle on remaining dough over top. Bake at 350 for 25 minutes. Remove from oven and let cool to room temperature. Cut in bars and serve. Cover with foil and store in fridge.