JSFiddle - React, Tailwind, and code Playground

by Rey Doe

JavaScript

var Dia = 24*60*60*1000; 
// hoiras*minutos*segundos*milesimas
var Inicial = new Date(2017,02,12);
var Final = new Date(2017,02,22);

var Diferencia = Math.round(Math.abs((Inicial.getTime() - Final.getTime())/(Dia)));

alert(Diferencia);