unexpected javascript date behavior

Question

I have the following code:

var newDate=new Date('05/22/2012');
var month=newDate.getMonth();
var day=newDate.getDate()+(-2);
var year=newDate.getYear();
document.write(month+'/'+day+'/'+year);

I expected it to return '05/20/2012' but instead it returns '04/20/2012'

This makes no sense to me - can someone help me understand what's going on and how to get the correct response?

Thank you for your kind attention!

Dutchie432 · Accepted Answer · 2012-05-22 16:38:31Z

10

.getMonth() is zero-based. as in 0=January and 11=December

try

var month=newDate.getMonth() + 1;

answered May 22, 2012 at 16:38

Dutchie432

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Comments

Colin Brock · Accepted Answer · 2012-05-22 16:38:23Z

7

.getMonth() is zero-based. January corresponds to 0, February to 1, etc.

As of the time of this question, the month is May, and therefore .getMonth() returns 4.

You want .getMonth() + 1.

answered May 22, 2012 at 16:38

Colin Brock

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2 Comments

jlisham Over a year ago

and THANK YOU! I marked the previous as the answer only because it was first - obviously yours is just as valid!

Colin Brock Over a year ago

@Dutchie432: Ditto! jlisham: You're welcome - I'm glad it helped.

TravisPaul · Accepted Answer · 2012-05-22 16:40:23Z

-1

getMonth() + 1

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Date/getMonth

answered May 22, 2012 at 16:40

TravisPaul

11

1 Comment

Andrew Barber Over a year ago

Welcome to Stack Overflow! Would you consider adding some narrative to explain why this code works, and what makes it an answer to the question?

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