javascript is creating date wrong month

using Mozilla Firefox Firebug:

var myDate = new Date(2012, 9, 23, 0,0,0,0);

Date {Tue Oct 23 2012 00:00:00 GMT-0400 (Eastern Daylight Time)}

Why does javascript create the date with the wrong month?

No, javascript's Date months start with 0, so 9 is a 10th month and it is October


new Date(year, month [, day, hour, minute, second, millisecond]);


month Integer value representing the month, beginning with 0 for January to 11 for December.

In the javascript world months begin with zero! kind of weird to me. Anyhow, 9 is NOT September, but rather 9 is October.