If you want to compare two dates, the Date object will do the following purpose. This describes the JavaScript Date Object including properties, constructors, and methods.

Here is the code example :-

var d1 = new Date();
var d2 = new Date(d1);
var Equalcomp = d1.getTime() === d2.getTime();
var notEqualcomp = d1.getTime() !== d2.getTime();

For ==, !=, === comparison you need to use the getTime() method otherwise it will not return the correct value.

for example :-

var d1 = new Date();
var d2 = new Date(d1);

console.log(d1 === d2);  // prints false 
console.log(d1 != d2);   // prints true

The above code snippet will return the wrong answer values. Therefore, you need to use getTime() method for this.