how to get next week date in javascript

function nextweek(){
    var today = new Date();
    var nextweek = new Date(today.getFullYear(), today.getMonth(), today.getDate()+7);
    return nextweek;
}

function dateObject.getNextWeekDay returns the next weekday after the object's own date.

Date.prototype.getNextWeekDay = function(d) {
  if (d) {
    var next = this;
    next.setDate(this.getDate() - this.getDay() + 7 + d);
    return next;
  }
}

var now = new Date();
var nextMonday = now.getNextWeekDay(1); // 0 = Sunday, 1 = Monday, ...
var secondNextMonday = new Date(nextMonday).getNextWeekDay(1);
console.log('Next Monday : ' + nextMonday);
console.log('Second Next Monday : ' + secondNextMonday);

var firstDay = new Date("2009/06/25");
var nextWeek = new Date(firstDay.getTime() + 7 * 24 * 60 * 60 * 1000);

You can also look at DateJS if you like "fluent" APIs.

Date.prototype.addDays = function (d) {
    if (d) {
        var t = this.getTime();
        t = t + (d * 86400000);
        this.setTime(t);
    }
};

this_week.addDays(7);