gistfile1.html

<link rel="stylesheet" href="/path/to/flipclock.css">
<style>
  .cd-container {
    display: inline-block;
  }
</style>
<div class="cd-container">
  <div class="countdown"></div>
</div>
<script src="/path/to/flipclock.min.js"></script>
  <script>
    var currentDate = new Date();
    var coutdownToDate  = new Date('YYYY-MM-DD HH:MM:SS');
    var diff = coutdownToDate.getTime() / 1000 - currentDate.getTime() / 1000;

    $('.countdown').FlipClock(diff, {
      autoStart: true,
      countdown: true,
      showSeconds: false,
      clockFace: 'DailyCounter',
      language: 'danish'
    });
  </script>