JSFiddle - React, Tailwind, and code Playground

JavaScript

var nowInMS = new Date().getTime(),
		threeYearsInMS = 1000 * 60 * 60 * 24 * 365 * 3,
    threeYearsBeforeNow = new Date(nowInMS - threeYearsInMS);

alert(threeYearsBeforeNow);