Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <script> function startTime() { var today=new Date(); var h=today.getHours(); var m=today.getMinutes(); var s=today.getSeconds(); // add a zero in front of numbers<10 m=checkTime(m); s=checkTime(s); document.getElementById('txt').innerHTML=h+":"+m+":"+s; t=setTimeout(function(){startTime()},500); } function checkTime(i) { if (i<10) { i="0" + i; } return i; } </script> </head> <body onload="startTime()"> <div id="txt"></div> </body> </html>
Result:
W3Schools.com - Try it yourself