swift sorting an array of objects

Question

I've an array of objects with one date field of type string. This is field represents 'UTC' date string. I'm not able to figure out a way to sort this array on the date field in swift 3.0.

Example:

 class Item {
   var name: String
   var type: String
   var dateAdded: String   //This contains UTC date string 
   init(name:String, type: String, dateAdded: String) {
      self.name = name
      self.type = type
      self.dateAdded = dateAdded
   }
}


var itemArray:[Item];
var item1 = Item(name: "Name1", type: "Person", dateAdded: "2018-03-05T13:15:30Z")
var item2 = Item(name: "Name2", type: "Animal", dateAdded: "2018-03-04T10:15:30Z")
itemArray.append(item1)
itemArray.append(item2)

Any help is appreciated.