I am working with moment.js, but as I am testing the moment.js library I continue to receive an error.
var back30Days=moment().subtract(30, \'days\').format(
With latest momentjs:
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
var back30Days=moment().subtract(30, 'days').format("ffffdd, MMMM Do YYYY, h:mm:ss p");
console.log('back30Days --> ' + back30Days);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>