Prepare couscous according to package directions. Set aside.

Whisk the olive oil, lemon juice, lemon zest and lime zest until mixed. Add the chickpeas, dates, Feta cheese, chives and mint. Whisk vigorously to incorporate all ingredients. Add the tomato and walnuts at the very end. Set aside.

With a fork, fluff the couscous until the grains are separated. Transfer to a large serving bowl. Pour the vinaigrette over the couscous, mixing it well.