In your comments you said javascript would be ok, so here it is in javascript.
This will do it for you: https://jsfiddle.net/4p18mxg9/5/
JAVASCRIPT
function myFunction() {
switch (new Date().getDay()) {
case 0:
day = "Sunday";
document.body.style.backgroundImage = "url('http://lorempixel.com/400/200/sports/1/')";
break;
case 1:
day = "Monday";
document.body.style.backgroundImage = "url('http://lorempixel.com/400/200/sports/1/')";
break;
case 2:
day = "Tuesday";
document.body.style.backgroundImage = "url('http://lorempixel.com/400/200/sports/1/')";
break;
case 3:
day = "Wednesday";
document.body.style.backgroundImage = "url('http://lorempixel.com/400/200/sports/1/')";
break;
case 4:
day = "Thursday";
document.body.style.backgroundImage = "url('http://lorempixel.com/400/200/sports/1/')";
break;
case 5:
day = "Friday";
document.body.style.backgroundImage = "url('http://lorempixel.com/400/200/sports/1/')";
break;
case 6:
day = "Saturday";
document.body.style.backgroundImage = "url('http://lorempixel.com/400/200/sports/1/')";
break;
}
document.getElementById("demo").innerHTML = "Today is " + day;
}
1
solved How to change a background depending on the current day [closed]