Preheat oven to 300 degrees F. and Line two baking sheets with parchment paper.In a mixing bowl, beat the egg whites with an electric mixer until stiff peaks form. Beat in the sugar a few tablespoons at a time. Stir in the pecans, dates and chocolate chips.With a generously rounded teaspoon, drop 12 mounds of cookie dough onto each baking sheet. Set one sheet on the middle rack and one on the lower rack and bake for 15 minutes.After 15 minutes, reduce the oven temperature to 275 degrees F, shift the baking sheets so that the sheet on the bottom is now on the top and vice versa. bake for another 15 minutes at 275 degrees F.Turn off oven and let the cookies sit in the closed “off” oven for about two hours.