Change the background of the site daily automatically

Hello, you have, you can change each background by the day of the week:

Script code:

<script type="text/javascript"><!--
    var imlocation = "Images/";
    function ImageArray (n) {
        this.length = n;
        for (var i =1; i <= n; i++) {
            this[i] = ' '
        }
    }
    image = new ImageArray(7);
    image[0] = 'sunday.PNG';
    image[1] = 'monday.PNG';
    image[2] = 'tuesday.PNG';
    image[3] = 'wednesday.PNG';
    image[4] = 'thursday.PNG';
    image[5] = 'friday.PNG';
    image[6] = 'saturday.PNG';
    var currentdate = new Date();
    var imagenumber = currentdate.getDay();
    document.write('<img src="' + imlocation + image[imagenumber] + '">');
</script>

Create a folder named Images and add the images with each name of the week, you can change the names to Portuguese.

It is possible, in the following example I make a background for each day of the week:

var images = [
  'https://www.cleverfiles.com/howto/wp-content/uploads/2016/08/mini.jpg',
  'https://upload.wikimedia.org/wikipedia/commons/1/1e/Stonehenge.jpg',
  'https://upload.wikimedia.org/wikipedia/commons/2/2a/Junonia_lemonias_DSF_upper_by_Kadavoor.JPG',
  'https://c1.staticflickr.com/6/5216/30091409642_42af7bf19f_b.jpg',
  'https://c2.staticflickr.com/6/5612/31035985960_096daebcb7_b.jpg',
  'http://www.kendirfuar.com/img/sabitler/eskiler/8-0b1555db83aa481e518543aac4af0ddf.jpg',
  'https://i.stack.imgur.com/XeIwO.png'
];

var week_day = new Date().getDay();
document.body.style.backgroundImage = 'url(' +images[week_day]+ ')';

In today's case (Tuesday) week_day returns 2, that is, the third image of our array images , with Sunday being 0 second is 1 , etc ...

DOCS