Local time in Campfire chats

campfire-localtime.js

// ==UserScript==
// @name       Campfire local time
// @namespace  http://tsonev.net/campfire/localtime
// @version    0.2
// @description  Converts time stamps to local time in Campfire chats. Tested in Chrome.
// @match      https://XXXXXX.campfirenow.com/room/*
// ==/UserScript==

var TIME_ZONE = "CDT";

function convertTimes() {
    var dates = document.querySelectorAll(".date span");
    var times = document.querySelectorAll(".time div");
    
    for (var i = 0; i < dates.length; i++) {
        if (!times[i]._converted) {
            var timestamp = new Date(dates[i].innerHTML + " " + times[i].innerHTML + " " + TIME_ZONE);
            times[i].innerHTML = timestamp.toLocaleTimeString();
            times[i]._converted = true;
        }
    }
}

window.addEventListener("load", function(e) {
    setInterval(convertTimes, 500);
}, false);