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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Dynamic welcome</title>
</head>
<body>
  <h1>Welcome message</h1>
  <pre id="out"></pre>
  <script>
    function welcomeMessage() {
      var dayOfWeek = new Date().getDay();
      if (dayOfWeek === 1 || dayOfWeek === 5) {
        return "Happy coding day!";
      }
      return "Enjoy your day!";
    }

    document.getElementById("out").textContent = welcomeMessage();
  </script>
</body>
</html>

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JavaScript Date getDay() — welcome message (Try It)