jQuery Countdown Script

countdown.css

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
  font-size: 30px
}

div.column-3 {
  width: 30%;
  display: inline;
  border: 1px solid #939;
  background-color: #909;
  padding: 8px;
}

.countdown-section {
  color: #fff;
  width: 600px;
}

countdown.html

<div class="countdown-section">
  <div class="column-3">
    <span class="countdown-span" data-count="30000000"></span>
  </div>
  <div class="column-3">
    <span class="countdown-span" data-count="2340000000"></span>
  </div>
  <div class="column-3">
    <span class="countdown-span" data-count="100000"></span>
  </div>
</div>
<script type="text/javascript">
  jQuery(document).ready(function() {
    jQuery(".countdown-section").countdown({
      classname: 'countdown-section'
    });
  });

</script>

countdown.js

/**
 * Make the below code as countdown.js and include the countdown js in the script.
 */
(function($) {

  $.fn.countdown = function(options) {
    // Default options
    var settings = $.extend({
      classname: options.classname
    }, options);

    $(this).find('.countdown-span').each(function(index, value) {
      var $this = $(this),
        countTo = $this.data('count');
      var lastItem;
      $({
        countNum: $this.text()
      }).animate({
        countNum: countTo
      }, {
        duration: 2000,
        easing: 'swing',
        step: function() {
          if (this.countNum >= 1000000000000) {
            var convert = this.countNum;
            var converted = Math.sign(convert) * ((Math.abs(convert) / 1000000000000).toFixed(1));
            $this.text(converted + "T");
            this.countNum = Math.floor(converted) + "T";
            lastItem = this.countNum;
          } else if (this.countNum >= 1000000000) {
            var convert = this.countNum;
            var converted = Math.sign(convert) * ((Math.abs(convert) / 1000000000).toFixed(1));
            $this.text(converted + "B");
            this.countNum = Math.floor(converted) + "B";
            lastItem = this.countNum;
          } else if (this.countNum >= 1000000) {
            var convert = this.countNum;
            var converted = Math.sign(convert) * ((Math.abs(convert) / 1000000).toFixed(1));
            $this.text(converted + "M");
            this.countNum = Math.floor(converted) + "M";
            lastItem = this.countNum;
          } else if (this.countNum >= 1000) {
            var convert = this.countNum;
            var converted = Math.sign(convert) * ((Math.abs(convert) / 1000).toFixed(1));
            $this.text(converted + "K");
            this.countNum = Math.floor(converted) + "K";
            lastItem = this.countNum;
          } else {
            $this.text(Math.ceil(this.countNum));
            var converted = $this.text();
            $this.text(converted);
          }
        },
        complete: function() {
          $this.text(lastItem);
        }
      });
    });
  };
}(jQuery));