orders.js

const orders = [
  { id: 1, quantity: 40, orderDate: new Date(2018, 1, 1, 1, 1, 1) },
  { id: 2, quantity: 20, orderDate: new Date(2018, 2, 2, 2, 2, 2) },
  { id: 3, quantity: 30, orderDate: new Date(2018, 3, 3, 3, 3, 3) },
  { id: 4, quantity: 10, orderDate: new Date(2018, 4, 4, 4, 4, 4) },
  { id: 5, quantity: 20, orderDate: new Date(2018, 5, 5, 5, 5, 5) }
];

const nullOrder = {
  id: -1,
  quantity: 0,
  orderDate: new Date(-8640000000000000)
};