HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getDayName helper</title>
</head>
<body>
  <h1>Weekday name</h1>
  <pre id="out"></pre>
  <script>
    var WEEKDAYS = [
      "Sunday", "Monday", "Tuesday", "Wednesday",
      "Thursday", "Friday", "Saturday"
    ];

    function getDayName(dayIndex) {
      return WEEKDAYS[dayIndex];
    }

    var today = new Date(2024, 1, 26);
    document.getElementById("out").textContent =
      "Today is a " + getDayName(today.getDay()) + ".";
  </script>
</body>
</html>

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JavaScript Date getDay() — day name helper (Try It)