JSFiddle - React, Tailwind, and code Playground
JavaScript
date = "4-1-2013";
date = date.split('-');
day = date[0].length == 1 ? "0" + date[0] : date[0];
month = date[1].length == 1 ? "0" + date[1] : date[1];
date = "" + day + month + date[2];
alert(date);