For the dressing: Combine 2 tablespoons vinegar, 2 teaspoons chopped thyme, 2 teaspoons honey, 1 teaspoon mustard, and 1 finely chopped shallot together in a small bowl. Whisk to dissolve the honey. Season with salt and freshly ground black pepper and whisk again. Slowly add the olive oil while whisking until all the oil has been incorporated.
Bring a medium saucepan of salted water to a boil over medium-high heat. Add 1 pound green beans and cook until just tender to the bite, about 4-5 minutes. Drain and submerge them in a bowl of ice water until cool to the touch. Drain again and pat dry.
Add vinaigrette, the 2 sliced shallots to the saucepan and heat over medium heat until warm. Add green beans and toss in the dressing until warmed through. Transfer to a serving plate and sprinkle tangerines, dates, and pistachios, and parsley over the top. Serve immediately.