Get difference between 2 dates in JavaScript

const date1 = new Date('10/15/2020');
const date2 = new Date('12/1/2020');

const diffTime = Math.abs(date2 - date1); // time in milliseconds
const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24)); // convert time to days

Note: Difference in date always return in milliseconds.

How to remember

- 1000 Milliseconds to 1 Sec
- 60 Sec 1 Minute
- 60 Min 1Hr
- 24 Hr to 1 Day