JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.jsdelivr.net/npm/moment@2.29.1/min/moment.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/moment-timezone@0.5.33/builds/moment-timezone-with-data.min.js"></script>
<!DOCTYPE html>
<html lang="en">
    <body id="page-top">
        <!-- Navigation-->
        <!-- Page Content-->
        <!-- Bootstrap core JS-->
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
        <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.bundle.min.js"></script>
        <!-- Third party plugin JS-->
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.4.1/jquery.easing.min.js"></script>
        <!-- Core theme JS-->
        <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.7.0/moment.min.js" type="text/javascript"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.33/moment-timezone-with-data.js" type="text/javascript"></script>
        <script src="js/myjs.js"></script>
        <!-- <script src="js/scripts.js"></script> -->
    </body>
</html>

JavaScript

function adjust_times_user_time_zone() {
    console.log(moment.tz("2015-08-05T00:00:00+01:00", "Europe/London"));
}

$(document).ready(function () {
    adjust_times_user_time_zone();
});