JSFiddle - React, Tailwind, and code Playground

JavaScript

var i;
var dt = "2016-04-28T19:15:27+09:00";
var parse = "Date.parse(d)";
var gettime = "new Date(d).getTime()";

console.time(parse);

for (i = 0; i < 100000; i++) {
  Date.parse(dt);
}

console.timeEnd(parse);
console.time(gettime);

for (i = 0; i < 100000; i++) {
  new Date(dt).getTime();
}

console.timeEnd(gettime);