JSFiddle - React, Tailwind, and code Playground

HTML

<p id="demo"></p>

JavaScript

var json = {"endTime": {
 "date": 20,
 "day": 5,
"hours": 0,
"minutes": 0,
"month": 1,
"seconds": 0,
"time": 1424370600000,
"timezoneOffset": -330,
"year": 115 }
 };
 

 document.getElementById("demo").innerHTML = new Date(json.endTime.time).toLocaleFormat("%Y-%m-%d");