Eggplant and Date Caponata Inspired by Mario Batali

Name: Eggplant and Date Caponata Inspired by Mario Batali
Ingredients: 1/2 pound dates (about 10 to 12 large Medjool dates); 1 1/2 pounds eggplant (unpeeled and cut into 1-inch cubes); salt and pepper (as needed); 1/2-3/4 cups olive oil (divided); 1 yellow onion (peeled and cut into 1-inch chunks); 2 cloves garlic (peeled and thinly sliced); 1/2 teaspoon crushed red pepper flakes (or more to taste); 1/2 cup tomato sauce (not too chunky); 1/4 cup balsamic vinegar; 2 tablespoons red wine vinegar; 1 teaspoon fresh thyme leaves; 1 teaspoon cocoa powder; 1/4 cup lightly toasted pine nuts (divided); 1 teaspoon freshly grated orange zest; toasted bread slices (for serving, optional)