Corsonus countdown

countdown.js

var startTimeInterval = setInterval(function(){
  jQuery.getJSON('http://api.corsonus.com/start.json?callback=?', function(data){
    var startTime = data.start_time;
    if (startTime){
      clearInterval(startTimeInterval);
      console.log('counting down...');
      var countdownInterval = setInterval(function(){
        // number of seconds
        var remaining = Math.round((startTime - Date.now()) / 1000);
        console.log('number of seconds remaining: ' + remaining);

        if (remaining <= 0) {
          console.log('start!');
          clearInterval(countdownInterval);
        }
      }, 1000);
    } else {
      console.log('waiting for start time');
    }
  })
}, 2000); // check every two seconds