Wedding Countdown Timer (copy from Google Sites since it won't let me copy to Google Drive)

code.gs

function doGet() {
  var template = HtmlService.createTemplateFromFile('index');

  var htmlOutput = template.evaluate()
                   .setSandboxMode(HtmlService.SandboxMode.NATIVE);

  return htmlOutput;
}

function include(filename) {
  return HtmlService.createHtmlOutputFromFile(filename)
      .getContent();
}

index.html

<?!= include('stylesheet'); ?>

<div id="countdown"></div>

<?!= include('javascript'); ?>

javascript.html

<script type="text/javascript">
// console.clear();
var countdown_html = document.getElementById("countdown");

function countdown() {

    var return_string = 'Only ';
    var today = new Date();
    var weddingDate = new Date(2014, 10, 8, 16);
    var ms = weddingDate - today;

    if (ms > 0) {
        var d = ms / (1000 * 60 * 60 * 24) | 0;
        var h = ms % (1000 * 60 * 60 * 24) / (1000 * 60 * 60) | 0;
        var m = ms % (1000 * 60 * 60) / (1000 * 60) | 0;
        var s = ms % (1000 * 60) / (1000) | 0;

        var timeParts = [d, h, m, s];
//        console.log(timeParts);
        var timeStringParts = new Array();
        var timeString = "";

        for (var i = 0; i < 4; i++) {

            switch (i) {
                case 0:
                    timeString = " day";
                    break;
                case 1:
                    timeString = " hour";
                    break;
                case 2:
                    timeString = " minute";
                    break;
                case 3:
                    timeString = " second";
                    break;
            }
            

            if (timeParts[i] > 1) {
                timeString += 's';
            }

            if (timeParts[i] > 0) {
                timeStringParts.push(timeParts[i] + timeString);
            }

        }

        for (var i = 0; i < timeStringParts.length - 1; i++) {

            return_string += timeStringParts[i] + ', ';
        }

        return_string += (' and ' + timeStringParts[timeStringParts.length - 1] + ' until man and wife!')

    } 
    else {
        return_string = "It's finally here!!";
    }

    return return_string;
}

setInterval(function() {
countdown_html.innerHTML = '<p>' + countdown() + '</p>';
}, 1000);
</script>

stylesheet.html

<style>
p {
  font-family: 'Bad Script', cursive;
  color: #469280;
  font-size: 24px;
  text-align: center;
  vertical-align: "top";
}
body {
background-color: transparent;
}
</style>