Hello,
Since Kentico is a ASP.NET application which runs on a server, you need to use javascript for a client-side scripting and getting current computer time like this:
<script type="text/javascript">
var currentTime = new Date()
var hours = currentTime.getHours()
var minutes = currentTime.getMinutes()
if (minutes < 10)
minutes = "0" + minutes
document.write("<b>" + hours + ":" + minutes + " " + "</b>")
</script>
You can place this script into the Javascript web part.
Best regards,
Jan Hermann