1function updateTime(){
2    var currentTime = new Date()
3    var hours = currentTime.getHours()
4    var minutes = currentTime.getMinutes()
5    if (minutes < 10){
6        minutes = "0" + minutes
7    }
8    var t_str = hours + ":" + minutes + " ";
9    if(hours > 11){
10        t_str += "PM";
11    } else {
12        t_str += "AM";
13    }
14    document.getElementById('time_span').innerHTML = t_str;
15}
16setInterval(updateTime, 1000);