var serverTimeOffset = <?php echo microtime(true); ?> - new Date().getTime()/1000;

function getServerTime() {
    return new Date().getTime()/1000 + serverTimeOffset;
}

function updateCountdown() {
    var time = Math.max(30 - (getServerTime() % 40), 0);
    document.getElementById('time').innerHTML = time.toFixed(2);

    window.requestAnimationFrame(updateCountdown);
}

    window.addEventListener('DOMContentLoaded', function() {
        updateCountdown();
        });

$(function () {

$.ajax({
  url: 'api.php',
  data: "",

  dataType: 'json',
  success: function(data)
  {
    var id = data[0];

    $('#output').html("<b>id: </b>"+id);
  }
});
  });