HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Scheduled hour</title>
</head>
<body>
  <h1>3 PM task</h1>
  <pre id="out"></pre>
  <script>
    var scheduledHour = 15;
    var currentHour = new Date().getHours();
    var message;

    if (currentHour === scheduledHour) {
      message = "Task scheduled for 3:00 PM is running.";
    } else {
      message = "No task at this hour.";
    }

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

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JavaScript Date getHours() — scheduled task (Try It)