subtracting day subtracts month too in Java Script

Question

In below code when I subtract day from date I get day as well as month subtracted by one.

var today = new Date();

today.setDate(today.getDate() - 1);

var dd = today.getDate();
var mm = today.getMonth() + 1;  //Here is the problem so I have to do +1 to get to current month
var yyyy = today.getFullYear();

Anyone any idea why does this happen? Or if I am doing it in the wrong way can anyone suggest the right way?

I think you are confused , `getMonth()` always needs to `+1` because it starts from 0. — Mritunjay, Aug 08 '14 at 10:58

score 2 · Accepted Answer · answered Aug 08 '14 at 10:58

2

with javascript's date.getMonth() method, months are 0-11, there is nothing wrong here

answered Aug 08 '14 at 10:58

birdspider

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score 0 · Answer 2 · answered Aug 08 '14 at 11:01

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Oh ya I just saw the details in http://www.w3schools.com/jsref/jsref_getmonth.asp

The getMonth() method returns the month (from 0 to 11) for the specified date, according to local time.

Thank you for the information guys!

answered Aug 08 '14 at 11:01

Er. ßridy

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Glad you solved it...according to StackOverflow guidelines though, this comment should be edited into your question rather than posted as an answer. And you should upvote and accept @birdspider's answer if it was helpful to you. – Matt Browne Aug 08 '14 at 11:08

score 0 · Answer 3 · answered Aug 08 '14 at 11:03

0

You've got confused.

.getDate returns day of the month, from 1 to 31.

But .getMonth returns month index, starting from 0 (from 0 to 11).

Blame Java legacy for that ;)

answered Aug 08 '14 at 11:03

c69

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subtracting day subtracts month too in Java Script

3 Answers3