JSFiddle - React, Tailwind, and code Playground

HTML

<img id="sign" src="">

JavaScript

var dateAPI = 'https://script.google.com/macros/s/AKfycbyd5AcbAnWi2Yn0xhFRbyzS4qMq1VucMVgVvhul5XqS9HkAyJY/exec?tz=America/New_York';

$.getJSON(dateAPI).then(function (dateInfo) {
  var OPENAT = 14; // 2pm (12 + 2) 
  var CLOSEAT = 15; // 3pm (12 + 3) 
  var currentHour = dateInfo.hours; // from API
  if (currentHour >= OPENAT && currentHour <= CLOSEAT) {
    sign.src = "x.jpg";
  } else {
    sign.src = "y.jpg";
  }
});