HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Last day of month</title>
</head>
<body>
  <h1>Last day of March</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date(2026, 2, 10);
    date.setMonth(3, 0);
    document.getElementById("out").textContent =
      "Last day: " + date.getDate();
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

JavaScript Date setDate() — last day of month (Try It)