Return text on dom

HTML

<h1 id="yourElementId">here </h1>

JavaScript

var today = new Date();
 var curHr = today.getHours();
 function greeting() {
 if ( curHr < 12) {
  return 'Good Morning';
 } else if ( curHr < 18) {
    return  'Good Afternoon';
 } else if ( curHr < 20) {
   return  'Good Evening';
 } else {
    return 'Good Night';
 }
}

var xyz= greeting()
alert(xyz)
document.getElementById('yourElementId').textContent =xyz
console.log(xyz)