Как организовать таймер новостей?

<script>
            var t = 1436735021;

            if(t>0){
            var left = parseInt(1437328800 - t);
            setInterval(function() {
              var foo = new Date;
              left = left - 1;
              //console.log(t, typeof(l));
              if (left > 0){
              minutes = left / 60 | 0,
              hours = minutes / 60 | 0,
              days = hours / 24 | 0,
              hours = hours % 24;
              if (hours < 10){hours = "0"+hours};
            seconds = left%60;
              if (seconds < 10){seconds = "0"+seconds};
            minutes %= 60;
              if (minutes < 10){minutes = "0"+minutes};
              dd = " дней ";
              tid = "";
              if (days == 1){dd = " день "};
              if (days < 5 && days > 1){dd = " дня "};
              if (days > 0){tid = days + dd};
              document.getElementById('nextserial').style.display="block";
              if(days>0){
              document.getElementById('nextserial').innerHTML = "До выхода следующей серии осталось:<span>"+ days + " "+ dd + " и " + hours +":"+ minutes +":"+ seconds+"</span>";
              } else document.getElementById('nextserial').innerHTML = "До выхода следующей серии осталось:<span>"+ days + ":" + hours +":"+ minutes +":"+ seconds+"</span>"; 
              }
          }, 1000);
            } 
            </script>