JSFiddle - React, Tailwind, and code Playground

JavaScript

var d = new Date("2014-09-01"); 
var days = ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
alert(d);
d.setTime( d.getTime() + d.getTimezoneOffset()*60000 ); 
alert(d);
alert( days[d.getDay()] )