js datetime add days 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

Date.prototype.addDays = function(days) {
    var date = new Date(this.valueOf());
    date.setDate(date.getDate() + days);
    return date;
}