JSFiddle - React, Tailwind, and code Playground

HTML

<input data-bind="value: someDate" type="date"></input>
<br />
<input data-bind="value: dateString" type="date"></input>
<input data-bind="value: covert(dd)" type="date"></input>

JavaScript

var viewModel = {
    dd="/Date(1367708400000)/",
    someDate: new Date(parseInt("/Date(1367708400000)/".substr(6))),
    dateString: ko.observable('02/02/2002'),
    convert:function(value){return new Date(parseInt( value.substr(6)))}
};
console.log(viewModel.someDate);
console.log(viewModel);
ko.applyBindings(viewModel);