Question

I have some trouble with date manipulation in Javascript.

I have one variable which is firstDay, that’s date that I’m operating on.

To firstDay I add X days from one variable, and Y days from another:

var from_date = new Date(firstDay); // firstDay is a string with date: 2012/07/28
var to_date = new Date(firstDay);

var X = 1;
var Y = 5;

from_date.setDate(from_date.getDate() + X);
to_date.setDate(to_date.getDate() + Y);

So from_date now contains date 29.07.2012 and to_date is 02.08.2012. I don’t know why date changes properly, but months stay the same.

Where I make something wrong?

Answer 1

Copy & pasted your code, it worked as expected: http://jsfiddle.net/kDYdW/4/

The only differences is firstDay, so I assume you have problem with that maybe.

You also say that “months stay the same” but you reported to have July in from_date and June in to_date (29.07.2012 and 02.06.2012).

Update: added the proper revision of the jsfiddle