USing moment.js to format date

HTML

<script src="https://rawgit.com/timrwood/moment/master/moment.js"></script>
<code id="time"></code>

JavaScript

var midnight = "0:00:00";
var now = null;

setInterval(function () {
    now = moment().format("H:mm:ss");
    if (now === midnight) {
        alert("Hi");
    }
    $("#time").text(now);
}, 1000);