JSFiddle - React, Tailwind, and code Playground

JavaScript

var d1 = new Date(2017, 0, 1); // 2 januari 2017 
var d2 = new Date(2017, 0, 2); // 1 januari 2017

compare_date(d1,d2);

function compare_date(date1,date2){  
  if (date1 > date2) {
    alert("Date One is greather than Date Two.");
  }else if (date2 > date1) {
    alert("Date Two is greather than Date One.");
  }
  else{
    alert("Both are equal.");
  }
}