How to add number of days to today's date? [duplicate]

Answer 1

Pure JS solution, with date formatted YYYY-mm-dd format

var someDate = new Date('2014-05-14');
someDate.setDate(someDate.getDate() + 15); //number  of days to add, e.x. 15 days
var dateFormated = someDate.toISOString().substr(0,10);
console.log(dateFormated);

Answer 2

Moment.js

Install moment.js from here.

npm : $ npm i --save moment

Bower : $ bower install --save moment

Next,

var date = moment()
            .add(2,'d') //replace 2 with number of days you want to add
            .toDate(); //convert it to a Javascript Date Object if you like

Link Ref : http://momentjs.com/docs/#/manipulating/add/

Moment.js is an amazing Javascript library to manage Date objects and extremely light weight at 40kb.

Good Luck.

Answer 3

function addDays(n){
    var t = new Date();
    t.setDate(t.getDate() + n); 
    var month = "0"+(t.getMonth()+1);
    var date = "0"+t.getDate();
    month = month.slice(-2);
    date = date.slice(-2);
     var date = date +"/"+month +"/"+t.getFullYear();
    alert(date);
}

addDays(5);

Answer 4

I found that JavaScript can return a correct date when you use new Date(nYear, nMonth, nDate); with the over days of that month. Try to see the result of a dDate variable when you use this:

var dDate = new Date(2012, 0, 34); // the result is 3 Feb 2012

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I have a SkipDate function to share:

    function DaysOfMonth(nYear, nMonth) {
        switch (nMonth) {
            case 0:     // January
                return 31; break;
            case 1:     // February
                if ((nYear % 4) == 0) {
                    return 29;
                }
                else {
                    return 28;
                };
                break;
            case 2:     // March
                return 31; break;
            case 3:     // April
                return 30; break;
            case 4:     // May
                return 31; break;
            case 5:     // June
                return 30; break;
            case 6:     // July
                return 31; break;
            case 7:     // August
                return 31; break;
            case 8:     // September
                return 30; break;
            case 9:     // October
                return 31; break;
            case 10:     // November
                return 30; break;
            case 11:     // December
                return 31; break;
        }
    };

    function SkipDate(dDate, skipDays) {
        var nYear = dDate.getFullYear();
        var nMonth = dDate.getMonth();
        var nDate = dDate.getDate();
        var remainDays = skipDays;
        var dRunDate = dDate;

        while (remainDays > 0) {
            remainDays_month = DaysOfMonth(nYear, nMonth) - nDate;
            if (remainDays > remainDays_month) {
                remainDays = remainDays - remainDays_month - 1;
                nDate = 1;
                if (nMonth < 11) { nMonth = nMonth + 1; }
                else {
                    nMonth = 0;
                    nYear = nYear + 1;
                };
            }
            else {
                nDate = nDate + remainDays;
                remainDays = 0;
            };
            dRunDate = Date(nYear, nMonth, nDate);
        }
        return new Date(nYear, nMonth, nDate);
    };

Answer 5

The accepted answer here gave me unpredictable results, sometimes weirdly adding months and years.

The most reliable way I could find was found here Add days to Javascript Date object, and also increment month

var dayOffset = 20;
var millisecondOffset = dayOffset * 24 * 60 * 60 * 1000;
december.setTime(december.getTime() + millisecondOffset); 

EDIT: Even though it has worked for some people, I don't think it is entirely correct. I would recommend going with a more popular answer or using something like http://momentjs.com/

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Answer 6

Date.prototype.addDays = function(days)
{
    var dat = new Date(this.valueOf() + days * 24 * 60 * 60 * 1000 );
    return dat;
}