in typescript/app.ts [30:38]
private timestampToString(timestamp): String {
// https://stackoverflow.com/questions/847185/convert-a-unix-timestamp-to-time-in-javascript
var date = new Date(timestamp*1000);
var hours = date.getHours();
var minutes = "0" + date.getMinutes();
var seconds = "0" + date.getSeconds();
var formattedTime = hours + ':' + minutes.substr(-2) + ':' + seconds.substr(-2);
return formattedTime;
}