I want to run the countdown every 30 minutes in following code, countdown should be run in every 30 minutes.

function createCountDown(elementId, sec) {
        var tms = sec;
        var x = setInterval(function() {
            var distance = tms*1000;
            var days = Math.floor(distance / (1000 * 60 * 60 * 24));
            var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
            var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
            var seconds = Math.floor((distance % (1000 * 60)) / 1000);
            document.getElementById(elementId).innerHTML =days+"d: "+ hours + "h "+ minutes + "m " + seconds + "s ";
            if (distance < 0) {
                clearInterval(x);
                document.getElementById(elementId).innerHTML = "{{__('COMPLETE')}}";
            }
            tms--;
        }, 1000);
    }
  createCountDown('counter', {{\Carbon\Carbon::tomorrow()->diffInSeconds()}});
  }
}
};