JSFiddle - React, Tailwind, and code Playground
JavaScript
var todayDate = new Date();
alert("After adding ONE hour : "+new Date(todayDate.setHours(todayDate.getHours()+1)) );
var todayDate = new Date();
alert("After adding ONE hour : "+new Date(todayDate.setHours(todayDate.getHours()+1)) );