Javascript Timer start and end

05 : 00

 

<script>

$(document).ready(function(){

  var timer2 = "05 : 01";

  var interval = setInterval(function() {

    var timer = timer2.split(':');

    //by parsing integer, I avoid all extra string processing

    var minutes = parseInt(timer[0], 10);

    var seconds = parseInt(timer[1], 10);

    --seconds;

    minutes = (seconds < 0) ? --minutes : minutes;

    if (minutes < 0) clearInterval(interval);

    seconds = (seconds < 0) ? 59 : seconds;

    seconds = (seconds < 10) ? '0' + seconds : seconds;

    //minutes = (minutes < 10) ?  minutes : minutes;

    if(minutes == 0 && seconds == 0) {

      console.log(minutes + "  "+ seconds);

      clearInterval(interval);

      localStorage.removeItem('timerstart');

    }

    $('#timerSec').html(minutes + ' : ' + seconds);

    timer2 = minutes + ' : ' + seconds;

  }, 1000);

})

</script>

<strong id="timerSec" class="bold-text">05 : 00</strong>