clock.js

function clock(){

    var hours = document.getElementById('hours');
    var minutes = document.getElementById('minutes');
    var seconds = document.getElementById('seconds');
    var ampm = document.getElementById('ampm');

    var h = new Date().getHours();
    var m = new Date().getMinutes();
    var s = new Date().getSeconds();

    /* am/pm section */
    var am = "AM"
    if(h>12){
        h = h-12;
        var am = "PM";
    }
    
    /* section which adds a zero before each single digits */
    h = (h < 10) ? "0" + h : h;
    m = (m < 10) ? "0" + m : m;
    s = (s < 10) ? "0" + s : s;

    hours.innerHTML = h;
    minutes.innerHTML = m;
    seconds.innerHTML = s;
    ampm.innerHTML = am;

}
var interval = setInterval(clock, 1000);