maxDate

Returns the maximum of the given dates.

• Use the ES6 spread syntax with Math.max() to find the maximum date value.
• Use new Date() to convert it to a Date object.

const maxDate = (...dates) => new Date(Math.max(...dates));

const dates = [
  new Date(2017, 4, 13),
  new Date(2018, 2, 12),
  new Date(2016, 0, 10),
  new Date(2016, 0, 9)
];
maxDate(...dates); // 2018-03-11T22:00:00.000Z