memento-mori/index.html at master · hughbien/memento-mori · GitHub

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<html>
<head>
  <title>New Tab</title>
  <style>
    body { background: #f6f6f6; color: #000; font-family: monaco; }
    p { margin: -1.3em 0 0 0; padding: 0; position: relative; top: 50%; text-align: center; width: 100%;
        transform: translateY(-50%); -ms-transform: translateY(-50%); -webkit-transform: translateY(-50%); }
    #year { font-size: 80px; }
    #deciyear { font-size: 27px; position: relative; bottom: 27px; right: 9px; }
  </style>
</head>
<body>
  <p>
    <b id="year"></b>
    <span id="deciyear"></span>
  </p>
  <script>
    var dob = new Date("January 1, 1980 00:00:00");

    function getYear(now) {
      var year = now.getFullYear() - dob.getFullYear();
      var delta = new Date(now.getTime());
      delta.setFullYear(dob.getFullYear());

      if (delta < dob) {
        year -= 1;
      }
      return year.toString();
    }

    function getDeciyear(now) {
      var delta = new Date(now.getTime());
      delta.setFullYear(dob.getFullYear());

      if (delta < dob) {
        delta.setFullYear(delta.getFullYear() + 1);
      }

      var duration = delta - dob;
      var decisecondsInYear = 31556900000;
      return (duration / decisecondsInYear).toFixed(9).toString().split(".")[1];
    }

    setInterval(function() {
      var now = new Date();
      document.getElementById("year").innerHTML = getYear(now);
      document.getElementById("deciyear").innerHTML = "." + getDeciyear(now);
    }, 100);
  </script>
</body>
</html>