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HTML 

              
                <main id="container" class="nightmode">
	<time id="date" class="clocktext"></time>
	<time id="time" class="clocktext"></time>
	<button id="gpsbutton">Get GPS Location</button>
	<div id="gps" class="clocktext infotext"></div>
</main>
  <!-- A simple clock that fits on an old iPhone 4s so you can reuse your old device as a wall clock. This version also includes geolocation. -->
!

CSS 

              
                html {font-size:16px;}
body {
    padding:0;
    margin:0;
    font-family:TrebuchetMS,Arial,sans-serif;
}
#container {
    margin:0 auto;
    padding:0;
    width:100vw;
    height:100vh;
    text-align:center;
    overflow:hidden;
}
.nightmode {
    background-color:#121212;
    background-image: linear-gradient(to bottom left, #121212 10%,#333955 100%);
    color:#fff;
    text-shadow:1px 1px 1px black;
}
.daymode {
    background-color: #87ceeb;
    background-image: linear-gradient(to bottom left, #87ceeb 0%,#fff 100%);
    color:#333;
    text-shadow:1px 1px 10px white;
}
.clocktext {
    display:block;
    margin:0;
    padding:1px 0 0 0;
    width:100%;
    text-align:center;
    line-height:1.2;
    white-space:nowrap;
}
.infotext {
    padding:0 5px 0 5px;
    font-size:1.3rem;
    line-height:1.4;
    width:auto;
}
#date {
    font-size:1.3rem;
    padding-top:15px;
}
#time {
    font-size:5rem;
    margin:1px 0 0 0;
}
#time span {
    display:inline-block;
    padding:0;
    vertical-align: baseline;
    text-align:left;
    width: 2em;
    margin:0 0 0 0.5em;
    font-size:1.5rem;
    line-height:1.5;
    white-space:normal;
}
#gpsbutton {
    -webkit-appearance: none;
    -moz-appearance: none;
    display:block;
    margin:0 auto;
    padding:0 16px 0 16px;
    width:auto;
    height:40px;
    border:2px outset #fff;
    border-radius:12px;
    background:#dedeff;
    color:black;
    font-size:20px;
    cursor:pointer;
}
#gpsbutton:hover {
    background:#000033;
    border:2px inset #fff;
    color:#fff;
}
@media (min-width: 480px){
    #date {font-size:2rem;}
    #time {font-size:8rem;}
    #time span {
        font-size:2rem;
        line-height: 2;
    }
   .infotext {
        font-size:1.8rem;
    }
}
!

JS 

              
                //NOTE: ES5 chosen instead of ES6 for compatibility with older mobile devices
var now, dd, td;
var lat, lon, gd, gpsbutton;
var months = ["January","February","March","April","May","June","July","August","September","October","November","December"];
var days = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];

document.addEventListener("DOMContentLoaded", init, false);
function init(){
  dd = document.getElementById("date");
  td = document.getElementById("time");
  gd = document.getElementById("gps");
  gpsbutton = document.getElementById("gpsbutton");
  gpsbutton.addEventListener("click",getLocation,false);
  updateTime();
  setInterval(updateTime,1000);
}
function updateTime(){
  var clockdata = getClockStrings();
  dd.innerHTML = clockdata.datehtml;
  td.innerHTML = clockdata.timehtml;
  dd.dateTime = now.toISOString();
  td.dateTime = now.toISOString();
  var sec = now.getSeconds();
  var minutes = now.getMinutes();
  if (sec === 0){
    if (minutes % 5 === 0){
      getLocation(); //get location every 5 minutes while the app is running
    }
  }
}
function getClockStrings(){
  now = new Date();
  var year = now.getFullYear();
  var month = months[now.getMonth()];
  var date = now.getDate();
  var day = days[now.getDay()];
  var hour = now.getHours();
  var minutes = now.getMinutes();
  var seconds = now.getSeconds();
  var meridian = hour < 12 ? "AM" : "PM";
  var clockhour = hour > 12 ? hour - 12 : hour;
  if (hour === 0) {clockhour = 12;}
  var clockminutes = minutes < 10 ? "0" + minutes : minutes;
  var clockseconds = seconds < 10 ? "0" + seconds : seconds;
  var datehtml = day + ", " + month + " " + date + ", " + year;
  var timehtml = clockhour + ":" + clockminutes + "<span>:" + clockseconds + " " + meridian + "</span>";
  return {"datehtml":datehtml,"timehtml":timehtml};
}

function getLocation() {
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(showPosition);
  }else{
    gd.innerHTML = "location unknown";
    firsttime = false;
  }
}
function showPosition(position) {
  gpsbutton.style.display = "none";
  lat = position.coords.latitude;
  lon = position.coords.longitude;
  gd.innerHTML = "GPS: " + lat.toFixed(2) + "&nbsp;|&nbsp;" + lon.toFixed(2);
}
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999px

Console