Preheat oven to 300°F. Mix first 7 ingredients in large bowl. Melt butter with honey in heavy small saucepan over low heat. Pour over granola mixture and toss well. Spread out mixture on baking sheet. Bake 20 minutes, stirring occasionally. Add dates; mix to separate any clumps. Continue to bake until granola is golden brown, stirring frequently, about 15 minutes longer. Cool. Do ahead Can be made 2 weeks ahead. Store airtight at room temperature.