I'm not too experienced in this field but I know some.
I'm fixing up an eCommerce website and I want to add an feature - that on top of the add to cart button it should say let's say it's sunday "Orders placed now will ship monday" like this website http://robertscamera.com/photo/point-and-shoots/touchscreen/coolpix-s4000.html it should always write the next bussiness day.
I started something but it's not close to what I want:
var d=new Date();
var weekday=new Array(7);
document.write("Orders placed now will ship " + weekday[d.getDay()]);