JSFiddle - React, Tailwind, and code Playground
HTML
<div id="hellow"></div>JavaScript
let hello=document.getElementById('hellow');
let date = new Date().getHours();
if(date>= 6 && date <= 12){
hello.innerHTML = "Утро";
}else if(date>= 12 && date <= 13){
hello.innerHTML = "Обед";
}else if(date>= 13 && date <= 18){
hello.innerHTML = "День";
}else if(date>= 18 && date <= 22){
hello.innerHTML = "Вечер";
}else{
hello.innerHTML = "Ночь";
}