How to show current time in JavaScript in the format HH:MM:SS?

You can use native function Date.toLocaleTimeString():

var d = new Date();
var n = d.toLocaleTimeString();

This will display e.g.:

"11:33:01"

MDN: Date toLocaleTimeString

var d = new Date();
var n = d.toLocaleTimeString();
alert("The time is: \n"+n);