https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
http://web.crea.acsta.net/rep_dif/Smart/Warner/BatmanVsSuperman/Arrobas-250/Contagem/dest/jquery.countdown.js

  $(function() {
    var endDate = "march 28, 2016 20:00:00";

    $('.countdown.simple').countdown({ date: endDate });

    $('.countdown.styled').countdown({
      date: endDate,
      render: function(data) {
        $(this.el).html("

");

if(this.leadingZeros(data.days, 2)==”00″ && this.leadingZeros(data.hours, 2)==”00″ && this.leadingZeros(data.min, 2)==”00″ && this.leadingZeros(data.sec, 2) == “00”) {
alert(“fim da contagem”);
}

        }
    });

    $('.countdown.callback').countdown({
      date: +(new Date) + 10000,
      render: function(data) {
        $(this.el).text(this.leadingZeros(data.sec, 2) + " sec");
      },
      onEnd: function() {
        $(this.el).addClass('ended');
      }
    }).on("click", function() {
      $(this).removeClass('ended').data('countdown').update(+(new Date) + 10000).start();
    });

    // End time for diff purposes
    var endTimeDiff = new Date().getTime() + 15000;
    // This is server's time
    var timeThere = new Date();
    // This is client's time (delayed)
    var timeHere = new Date(timeThere.getTime() - 5434);
    // Get the difference between client time and server time
    var diff_ms = timeHere.getTime() - timeThere.getTime();
    // Get the rounded difference in seconds
    var diff_s = diff_ms / 1000 | 0;

    var notice = [];
    notice.push('Server time: ' + timeThere.toDateString() + ' ' + timeThere.toTimeString());
    notice.push('Your time: ' + timeHere.toDateString() + ' ' + timeHere.toTimeString());
    notice.push('Time difference: ' + diff_s + ' seconds (' + diff_ms + ' milliseconds to be precise). Your time is a bit behind.');

    $('.offset-notice').html(notice.join('<br />'));

    $('.offset-server .countdown').countdown({
      date: endTimeDiff,
      offset: diff_s * 1000,
      onEnd: function() {
        $(this.el).addClass('ended');
      }
    });

    $('.offset-client .countdown').countdown({
      date: endTimeDiff,
      onEnd: function() {
        $(this.el).addClass('ended');
      }
    });

  });