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<!DOCTYPE html> <html> <body> <p>Click the button to display seconds and milliseconds after changing both of them.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var d = new Date(); d.setSeconds(35, 825); var s = d.getSeconds(); var ms = d.getMilliseconds(); var x = document.getElementById("demo"); x.innerHTML = s + ":" + ms; } </script> </body> </html>