Preheat your oven to 325. In a medium bowl, pour the boiling water over the dates and mash them. Let this mixture cool before adding the baking soda; set aside.
Cream together the butter, 1 cup of sugar, beaten eggs, and vanilla. Sift together the flour, cocoa and salt. Stir all three of these mixtures together and pour into greased 9x13 pan.
Stir together the other 1/2 cup of sugar, chocolate chips and nuts; sprinkle over cake. Bake at 325 for 38 minutes, or until cake tests done in center. Serve with whipped cream.
Whipping cream:
In a medium bowl, add the cream and whip for 3-5 minutes until thick (don't over-whip).
Add sugar and vanilla; mix together and serve on top of the cake.