JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/knockout/2.2.1/knockout-min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/knockout.mapping/2.3.5/knockout.mapping.js"></script>
<script src="https://raw.github.com/timrwood/moment/2.0.0/min/moment.min.js"></script>
<span data-bind="text: DueDate" />

JavaScript

// Here's my data model
var viewModel;
var data = {
    "DueDate": "\/Date(1362124800000)\/"
}
var mappingOptions = {
    DueDate: {
        create: function (options) {
            return moment(options.data).format("MMM Do YY");
        }
    }
};
viewModel = ko.mapping.fromJS(data, mappingOptions);

ko.applyBindings(viewModel);