JSFiddle - React, Tailwind, and code Playground
HTML
<input type="text" id="dt">
JavaScript
var today = new Date("2015-12-01");
var dd = today.getDate();
var mm = today.getMonth()+1; //January is 0!
var yyyy = today.getFullYear();
if(dd<10){ dd='0'+dd }
if(mm<10){ mm='0'+mm }
var today = dd+'/'+mm+'/'+yyyy;
document.getElementById("dt").value = today;