unexpected javascript date behavior - Stack Overflow

admin管理员组

文章数量:1333201

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!

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!

• javascript

Share Improve this question Follow asked May 22, 2012 at 16:36 jlishamjlisham 14522 silver badges1212 bronze badges

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 10

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

try

var month=newDate.getMonth() + 1;

.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.

getMonth() + 1

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

本文标签： unexpected javascript date behaviorStack Overflow