Simple timestamp system in JavaScript; returns current time in hr:min:sec format

timestamp.js

timestamp = function(type) {
    if (type == undefined) {
        type = 24;
    }
    if (type == 24) {
        var currentDate = new Date();
        var hours = currentDate.getHours();
        var minutes = currentDate.getMinutes();
        var seconds = currentDate.getSeconds();
        var finalString = hours + ":" + minutes + ":" + seconds;
        return finalString;
    }
    else if (type == 12) {
        var currentDate = new Date();
        var hours = currentDate.getHours();
        if (hours == 24) {
            hours = 12;
            ampm = "AM"
        }
        if (hours > 12) {
            hours = hours - 12;
            ampm = "PM"
        }
        if (hours == 12) {
            hours = 12;
            ampm = "PM"
        }
        var minutes = currentDate.getMinutes();
        var seconds = currentDate.getSeconds();
        var finalString = hours + ":" + minutes + ":" + seconds + " " + ampm;
        return finalString;
    }
}

//Call with timestamp(12) or timestamp(24)
//See this post for more information: http://evilgeniustech.com/easy-javascript-timestamp/