JSFiddle - React, Tailwind, and code Playground

HTML

<img id="banner" alt="something important" />

JavaScript

function timeOfDayImage() {
    var now = new Date;
    var timeNow = now.getHours();
    var img = document.getElementById("banner");
    if (timeNow < 8 || timeNow > 10) {
        img.src="someimage.png";
        img.alt="Something equally appropriate";
    } else {
        img.src="someimage.png";
        img.alt="Something appropriate here too";
    }
}

timeOfDayImage();