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<!DOCTYPE html> <html> <body> <p>Click the button to display the date after changing it to be the last day of the previous month.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var d = new Date(); d.setUTCDate(0); document.getElementById("demo").innerHTML = d; } </script> </body> </html>