Countdown not working

Hi,

I am trying to set up the count down at http://anoxiapro.com.

It is working fine with the original code class (data-year="2021"):
<div id="countdown-ex1" class="countdown countdown-large coming-soon mx-auto mb-5" data-year="2021" style="max-width:700px;"></div>

But if I try to change the countdown to the end of this month, it is not working:

<div id="countdown-example" class="countdown countdown-large coming-soon mx-auto mb-5"></div>
<script>
  jQuery(document).ready( function($){
  var newDate = new Date(2020, 6, 30);
  $('#countdown-example').countdown({until: newDate});
  });
</script>

Could you please help me to fix this issue?

Regards,

Luiz