Getting Previous Date Using Javascript

Question

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.

Answer 1

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.