how to add day in date in javascript code example

Example 1: js date add 1 day

let date = new Date();
// add a day
date.setDate(date.getDate() + 1);

Example 2: javascript add days to date

var myCurrentDate=new Date();
var myFutureDate=new Date(myCurrentDate);
    myFutureDate.setDate(myFutureDate.getDate()+ 8);//myFutureDate is now 8 days in the future