I want to get the before six months date using javascript.

I am using the following method.

var curr = date.getTime(); // i will get current date in milli seconds
var prev_six_months_date = curr - (6* 30 * 24 * 60* 60*1000);
var d = new Date();
d.setTime(prev_six_months_date);

Is this the right way or any better way to get the last six months date.

If this get fixed I want to apply this logic to get previous dates like last 2 months and last 10 years etc.

If any body give the solution in jquery also very helpful to me. Thanks in advance.

I want to get the before six months date using javascript.

I am using the following method.

var curr = date.getTime(); // i will get current date in milli seconds
var prev_six_months_date = curr - (6* 30 * 24 * 60* 60*1000);
var d = new Date();
d.setTime(prev_six_months_date);

Is this the right way or any better way to get the last six months date.

If this get fixed I want to apply this logic to get previous dates like last 2 months and last 10 years etc.

If any body give the solution in jquery also very helpful to me. Thanks in advance.

• javascript
• jquery

• Since you tagged it jQuery, you can replace date.getTime() with $.now(). – alex Commented Feb 8, 2012 at 12:12
• It has been a long time since this question, but still : var d = new Date(); d.setMonth(d.getMonth()-6) Similarly, you can use setYears() and setDate() – Scrooge McD Commented Mar 22, 2015 at 18:38

3 Answers 3

Add more functionality to the Date

Date.prototype.addDays = function (n) {
    var time = this.getTime();
    var changedDate = new Date(time + (n * 24 * 60 * 60 * 1000));
    this.setTime(changedDate.getTime());
    return this;
};

Usage

var date = new Date();
/* get month back */
date.addDays(-30);

/* get half a year back */
date.addDays(-30 * 6);

No need for extra libraries, if this is only thing you need regarding dates. You can also create more functions to the Date's prototype according to your needs.

I would look into date.js. It's well tested and has a very fluent interface for manipulating dates and times in JavaScript.

An example of using date.js:

(6).months().ago()

Try:

var curr = new Date();
var prev_six_months_date = new Date(curr);
var prev_two_months_date = new Date(curr);
var prev_ten_years_date = new Date(curr);
prev_six_months_date.setMonth(curr.getMonth() - 6);
prev_two_months_date.setMonth(curr.getMonth() - 2);
prev_ten_years_date.setFullYear(curr.getFullYear() - 10);
console.log(prev_six_months_date.toString());
console.log(prev_two_months_date.toString());
console.log(prev_ten_years_date.toString());
console.log(curr.toString());