Finding date by subtracting X number of days from a particular date in Javascript

Question

I want to find date by subtracting X number of days from a particular date in JavaScript. My JavaScript function accepts 2 parameters. One is the date value and the other i

Answer 1

Simply:

yourDate.setDate(yourDate.getDate() - daysToSubtract);

Answer 2

Here i am posting one more answer and that will return date in specific format.

First you can get current date 10/08/2013 as below

function Cureent_Date() {
    var today_GMT = new Date();
    var dd = today_GMT.getDate();
    var mm = today_GMT.getMonth() + 1; //January is 0!
    var yyyy = today_GMT.getFullYear();
    if (dd < 10) {
        dd = '0' + dd
    }
    if (mm < 10) {
        mm = '0' + mm
    }
    current_date = mm + '/' + dd + '/' + yyyy;
    alert("current_date"+current_date);

    Back_date();
}

Now Get back date base on X days

function Back_date()
{    
    var back_GTM = new Date(); back_GTM.setDate(back_GTM.getDate() - 2); // 2 is your X
    var b_dd = back_GTM.getDate();
    var b_mm = back_GTM.getMonth()+1;
    var b_yyyy = back_GTM.getFullYear();
    if (b_dd < 10) {
        b_dd = '0' + b_dd
    }
    if (b_mm < 10) {
        b_mm = '0' +b_mm
    }

    var back_date=  b_mm + '/' + b_dd + '/' + b_yyyy;
    alert("back_date"+back_date);
}

So, Today is 10/08/2013 so it will return 10/06/2013.

Check Live Demo here Hope this answer will help you.

Answer 3

Just another option, which I wrote:

DP_DateExtensions Library

It's probably overkill if ALL you want to do is one calculation, but if you're going to do more date manipulation you might find it useful.

Supports date/time formatting, date math (add/subtract date parts), date compare, date parsing, etc.