A simple javascript countdown clock

countdown.js

$(document).ready(function(){
  countdown();
  setInterval(countdown, 1000);
  function countdown () {
  var now = moment(), // get the current moment
    // May 28, 2013 @ 12:00AM
    then = moment([2013, 4, 28]),
    // get the difference from now to then in ms
    ms = then.diff(now, 'milliseconds', true);
    // If you need years, uncomment this line and make sure you add it to the concatonated phrase
    /*
    years = Math.floor(moment.duration(ms).asYears());
    then = then.subtract('years', years);
    */
    // update the duration in ms
    ms = then.diff(now, 'milliseconds', true);
    // get the duration as months and round down
    months = Math.floor(moment.duration(ms).asMonths());

    // subtract months from the original moment (not sure why I had to offset by 1 day)
    then = then.subtract('months', months).subtract('days', 1);
    // update the duration in ms
    ms = then.diff(now, 'milliseconds', true);
    days = Math.floor(moment.duration(ms).asDays());

    then = then.subtract('days', days);
    // update the duration in ms
    ms = then.diff(now, 'milliseconds', true);
    hours = Math.floor(moment.duration(ms).asHours());

    then = then.subtract('hours', hours);
    // update the duration in ms
    ms = then.diff(now, 'milliseconds', true);
    minutes = Math.floor(moment.duration(ms).asMinutes());

    then = then.subtract('minutes', minutes);
    // update the duration in ms
    ms = then.diff(now, 'milliseconds', true);
    seconds = Math.floor(moment.duration(ms).asSeconds());
    
    // concatonate the variables
    diff = '<span class="num">' + months + '</span> months<br><span class="num">' + days + '</span> days<br><span class="num">' + hours + '</span> hours<br><span class="num">' + minutes + '</span> minutes<br><span class="num">' + seconds + '</span> seconds&#133;';
    $('#relative').html(diff);
  }

});

apparently on moment.js v2.8.1 moment().subtract(period, number) was deprecated and the api was changed to moment().subtract(number, period) just a switch in args will do the trick. Thank you!
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https://gist.github.com/paparts/71d068d132ee2f7d5883