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!

Answer 1

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

try

var month=newDate.getMonth() + 1;