JavaScript
const d = new Date();
d.setHours(22);
document.getElementById("demo").innerHTML = d.getDate();
console.log(const d);
document.getElementById("demo").innerHTML = Math.PI;
const r= new Date();
document.getElementById("demo").innerHTML = r.getHours();
var a=2;
var pi=document.getElementById("demo").innerHTML = Math.PI;
var r=document.getElementById("demo").innerHTML = r.getHours();
var c=a*pi*r;
var num=var c;
num = num.toFixed(3); // var c
document.getElementById("demo").innerHTML = c;
console.log(var c);