setInterval("settime()", 1000);

function settime () {
  var curtime = new Date();
  var curhour = curtime.getHours();
  var curmin = curtime.getMinutes();
  var cursec = curtime.getSeconds();
  var curdate = curtime.getDate();
  var curmonth = curtime.getMonth()+1;
  var curyear = curtime.getFullYear();
  var time = "";
 
  if(curhour == 0) curhour = 12;
  time = (curdate < 10 ? "0" : "") + curdate +
  			"/"+ (curmonth < 10 ? "0" : "") + curmonth + 
  			"/"+ curyear + " ";
  time += (curhour > 12 ? curhour - 12 : curhour) + ":" +
         (curmin < 10 ? "0" : "") + curmin + ":" +
         (cursec < 10 ? "0" : "") + cursec + " " +
         (curhour > 12 ? "PM" : "AM");
 
  document.getElementById('date-time').innerHTML = time;
}