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<html>
<body>
<!-- See live at https://codepen.io/paulera/pen/BPwPNw -->
<p class="clock" timezone="+2"></p>
<p class="clock" timezone="+4"></p>
<p class="clock" timezone="-7"></p>
<script>
function dateToText(date) {
var hours = date.getHours()
var minutes = date.getMinutes();
// var seconds = date.getSeconds();
if (minutes < 10) minutes = '0'+minutes;
//if seconds < 10) seconds = '0'+seconds;
if (hours < 10) hours = '0'+hours;
return hours + ":" + minutes; // + ":" + seconds;
}
function updateClocks() {
for (var i = 0; i < window.arrClocks.length; i++) {
var clock = window.arrClocks[i];
var offset = window.arrOffsets[i];
clock.innerHTML = dateToText(new Date(new Date().getTime()+offset));
}
}
function startClocks() {
clockElements = document.getElementsByClassName('clock');
window.arrClocks = []
window.arrOffsets = [];
var j = 0;
for(var i = 0; i < clockElements.length; i++) {
el = clockElements[i];
timezone = parseInt(el.getAttribute('timezone'));
if (!isNaN(timezone)) {
var tzDifference = timezone * 60 + (new Date()).getTimezoneOffset();
var offset = tzDifference * 60 * 1000;
window.arrClocks.push(el);
window.arrOffsets.push(offset);
}
}
updateClocks();
clockID = setInterval(updateClocks, 1000);
}
setTimeout(startClocks, 100);
</script>
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