From current year, how to find previous year and month based on the given input

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Hi all,
I want to know the below date in javascript
From current year,How to find previous year and month based on the given input
Note: count of month should be a 12 month.
Expected output:

input : 2016-04-26
output: 2015-05-26 // this is for output

please drop me a solution for this.

thanks in advance.

What I have tried:

From current year,How to find previous year and month based on the given input

Posted 29-Apr-16 2:37am

stellus

Updated 21-May-16 7:26am

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Comments

Karthik_Mahalingam 29-Apr-16 8:47am

what should be your output for '2016-01-26'

Richard MacCutchan 29-Apr-16 8:52am

Subtract 1 from the month. If the month is now zero, subtract 1 from the year. Subtract 1 from the year. Or maybe not; you really have not explained what you are trying to achieve (and your example makes it more confusing).

Herman<T>.Instance 29-Apr-16 10:50am

Exactly

George Jonsson 29-Apr-16 9:00am

School assignment, maybe?

Karthik_Mahalingam 29-Apr-16 9:03am

:-)

ZurdoDev 29-Apr-16 9:21am

Here you go, http://www.w3schools.com/jsref/jsref_obj_date.asp

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Prateek Dalbehera · Answer 1 · 2016-05-21T07:26:00

Hi,
You can use moment.js library for date related stuffs, but if you want to raw javascript,then you may try the below code,

JavaScript

var date = new Date($("#txt").value()); //or in any string as you required
var year= d.getFullYear();
var month = d.getMonth();

var previousYear = year - 1; // to get previous year
var prevoiusMonth = month + 2; //as u r calculating 12 months, just add 2 because           //getMonth returns 0-11
if(prevoiusMonth > 12) //exception when month is > 12, when month=december(11)
    prevoiusMonth = 1;//to make 13 to 1

Hope, this works, please revert back with your queries if any.

Thanks,
Prateek