JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/globalize/0.1.1/globalize.min.js"></script>
<span data-bind="text: date"></span>

JavaScript

ko.extenders.date = function(target, format) {
    return ko.computed({
        read: function() {
            var value = target();
            if(typeof value === "string") {
                value = new Date(value);                
            }
            
            format = typeof format === "string" ? format: undefined;
            value = Globalize.format(value, format);
            
            return value;        
        },
        write: target
    });
}

ViewModel = function() {
    this.date = ko.observable("2013-06-17T11:56:18.4537687Z").extend({ date: true });
}

ko.applyBindings(new ViewModel());