Using a heavy saucepan, mix together chopped dates, water, and granulated sugar.
Bring to a boil, reduce heat to medium-low. Simmer for approximately 5-10 minutes until dates have softened and water has evaporated . Let the mixture cool.
In a large bowl combine the oats, flour, baking soda, salt, cinnamon, and brown sugar.
Using a pastry blender, cut the butter into the oat mixture. Mix just until pea-sized clumps 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 Fahrenheit for 30 minutes. The top should crisp and golden brown.