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HTML

              
                <div class="clock"></div>
              
            
!

CSS

              
                .clock {
  width: 650px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
}

              
            
!

JS

              
                $(document).ready(function() {
  var clock;

  // Grab the current date
  var currentDate = new Date();

  // Target future date/24 hour time/Timezone
  var targetDate = moment.tz("2020-11-30 23:59", "Australia/Sydney");

  // Calculate the difference in seconds between the future and current date
  var diff = targetDate / 1000 - currentDate.getTime() / 1000;

  if (diff <= 0) {
    // If remaining countdown is 0
    clock = $(".clock").FlipClock(0, {
      clockFace: "DailyCounter",
      countdown: true,
      autostart: false
    });
    console.log("Date has already passed!")
    
  } else {
    // Run countdown timer
    clock = $(".clock").FlipClock(diff, {
      clockFace: "DailyCounter",
      countdown: true,
      callbacks: {
        stop: function() {
          console.log("Timer has ended!")
        }
      }
    });
    
    // Check when timer reaches 0, then stop at 0
    setTimeout(function() {
      checktime();
    }, 1000);
    
    function checktime() {
      t = clock.getTime();
      if (t <= 0) {
        clock.setTime(0);
      }
      setTimeout(function() {
        checktime();
      }, 1000);
    }
  }
});

              
            
!
999px

Console