Preheat oven to 350 degrees.
Grease 9x13 pan.
Using a heavy saucepan, mix together chopped dates, water, and granulated sugar.
Bring to boil, reduce heat to medium-low and simmer for approximately 5-10 minutes until dates have softened and water has evaporated . Let mixture cool.
In large bowl combine oats, flour, baking soda, salt, cinnamon, and brown sugar.
Using a pastry blender, cut the butter into the oat mixture until coarse crumbles form.
Spread half of the crumb mixture into bottom of greased baking pan. Press down.
Next spread the date mixture evenly over the crumb layer.
Top with the remaining crumb mix, pressing down slightly.
Bake 350 degrees for 30 minutes. The top should be nicely browned.
Cut into squares.