Preheat oven to 375°F (190°C).
Toss pita pieces with 1 tablespoon of olive oil and a pinch of salt on a baking sheet.
Bake pita for 8-10 minutes until golden brown and crisp; set aside to cool.
In a small bowl, whisk together remaining olive oil, red wine vinegar, sumac, salt, and pepper.
In a large mixing bowl, combine baby spinach, sliced dates, and red onion.
Drizzle the dressing over the salad and toss gently to coat.
Add the cooled pita chips and serve immediately.