Редактирование кода:
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<!DOCTYPE html> <html> <body> <p>Click the button to display the UTC time.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function addZero(x,n) { while (x.toString().length < n) { x = "0" + x; } return x; } function myFunction() { var d = new Date(); var x = document.getElementById("demo"); var h = addZero(d.getUTCHours(), 2); var m = addZero(d.getUTCMinutes(), 2); var s = addZero(d.getUTCSeconds(), 2); var ms = addZero(d.getUTCMilliseconds(), 3); x.innerHTML = h + ":" + m + ":" + s + ":" + ms; } </script> </body> </html>