JSFiddle - React, Tailwind, and code Playground

by jrab227

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.6/moment.js"></script>

JavaScript

var start1 = moment("2015-01-01")

var start2 = moment("2016-01-01")

var end1 = moment("2017-01-01")

var nonLeapYearMilliseconds = start2.diff(start1)

var leapYearMilliseconds = end1.diff(start2)

var extraSeconds = (leapYearMilliseconds - nonLeapYearMilliseconds) / 1000

console.log(extraSeconds)