JSFiddle - React, Tailwind, and code Playground

JavaScript

var dateString = "2012-02-04T21:00:00";
var current_date = new Date(dateString);
var month_names = [];
month_names[month_names.length] = "January";
month_names[month_names.length] = "February";
month_names[month_names.length] = "March";
month_names[month_names.length] = "April";
month_names[month_names.length] = "May";
month_names[month_names.length] = "June";
month_names[month_names.length] = "July";
month_names[month_names.length] = "August";
month_names[month_names.length] = "September";
month_names[month_names.length] = "October";
month_names[month_names.length] = "November";
month_names[month_names.length] = "December";
var day_names = [];
day_names[day_names.length] = "Sunday";
day_names[day_names.length] = "Monday";
day_names[day_names.length] = "Tuesday";
day_names[day_names.length] = "Wednesday";
day_names[day_names.length] = "Thursday";
day_names[day_names.length] = "Friday";
day_names[day_names.length] = "Saturday";

var startU = (day_names[current_date.getDay()]) + (", ") 
  + (month_names[current_date.getMonth()]) + (" ") + current_date.getDate() 
    + (" ") + (" ") + current_date.getFullYear();

alert(startU);