Change Background with CSS on particular date?

Question

Does anyone know how to change the background of a website automatically using CSS on specific dates? Like valentines, easter, xmas etc.

Answer 1

var date = new Date(),
    day = date.getDate(),
    month = date.getMonth()+1;

if (10 == month && 31 == day) {
    document.body.style.backgroundColor = "#FF9100";
}

Notice I added one (1) because the getMonth() method returns the month from 0 to 11 for the specified date, according to local time.