JAVASCRIPT

moment is not defined

Check if js is included properly

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
var back30Days=moment().subtract(30, 'days').format("dddd, MMMM Do YYYY, h:mm:ss p");

console.log('back30Days --> ' + back30Days);