JSFiddle - React, Tailwind, and code Playground

by John Doe

HTML

<span class="release-date"><i class="fa fa-calendar"></i> 2014-11-16</span>

JavaScript

var elem = document.getElementsByClassName('release-date')[0];
var text = elem.innerHTML;
var regex = /-(\d{1,2})-/m
var month = regex.exec(text);
var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'June', 'July', 'August', 'Sept', 'Oct', 'Nov', 'Dec']

if (month[1]) {
    elem.innerHTML = text.replace(regex, "-" + months[parseInt(month[1], 10) - 1] + "-")
}