Get started with jquery.countdown CDN

$(document).ready(function() {
  // Set the deadline for the countdown
  var deadline = new Date("Jan 5, 2023 00:00:00").getTime();

  // Initialize the countdown
  $('.countdown').countdown({
    timestamp: deadline,
    offset: -3 * 60 * 60, // adjust for your timezone (GMT-3 in this example)
    onExpiry: function() {
      // Do something when the countdown expires
      alert("Time's up!");
    },
    format: function(days, hours, minutes, seconds) {
      return days + "d " + hours + ":" + minutes + ":" + seconds;
    }
  });
});