JS: MomentJS Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.13/moment-timezone.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.13/moment-timezone-with-data.min.js"></script>

JavaScript

let currentTime = moment().tz('Europe/London')
 let opening = moment('9:00am', 'h:mma');
 let closing = moment('7:00pm', 'h:mma');


 if (currentTime.isBetween(opening, closing)) {

   openText = "It's business time!"

 } else {

   openText = "Not a business time!"

 }

console.log(openText)