Javascript to calculate 7 days ago? (2)

// Get today's current date.
var monthNames = new Array("1","2","3","4","5","6","7","8","9","10","11","12");
  var now = new Date();
  now.setDate(now.getDate());
 
// Get today's current date.
var now = new Date();

// Array list of days.
var days = new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday');

// Array list of months.
var months = new Array('1','2','3','4','5','6','7','8','9','10','11','12');

// Calculate the number of the current day in the week.
var date = ((now.getDate()<10) ? "0" : "")+ now.getDate();

// Calculate four digit year.
function fourdigits(number) {
 return (number < 1000) ? number + 1900 : number;
        }

// Join it all together
today = 
       now.getDate()

// Print out the data.
returnValue = today;