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Может быть поможет, попробуйте

<script language="javascript" type="text/javascript"> 
$(document).ready(function(){

function timer(){
    var intervalid = setInterval(function(){
        var now = new Date(); 
       var endTS = 1355391990*1000;
        var totalRemains = (endTS-now.getTime()); 
        if (totalRemains>1){ 
            var RemainsSec=(parseInt(totalRemains/1000)); 
            var RemainsFullDays=(parseInt(RemainsSec/(24*60*60))); 
            var secInLastDay=RemainsSec-RemainsFullDays*24*3600; 
            var RemainsFullHours=(parseInt(secInLastDay/3600)); 
            if (RemainsFullHours<10){RemainsFullHours="0"+RemainsFullHours}; 
            var secInLastHour=secInLastDay-RemainsFullHours*3600; 
            var RemainsMinutes=(parseInt(secInLastHour/60)); 
            if (RemainsMinutes<10){RemainsMinutes="0"+RemainsMinutes}; 
            var lastSec=secInLastHour-RemainsMinutes*60; 
            if (lastSec<10){lastSec="0"+lastSec}; 
            $('.timer>.digits').html((RemainsFullDays ? "<span>"+RemainsFullDays+"дн.</span> " :"")+RemainsFullHours+":"+RemainsMinutes+":"+lastSec);
        } 
        else { clearInterval(intervalid); timer(); } 
    },1000);
}

timer();

});
</script>