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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setDate return</title>
</head>
<body>
  <h1>Return value</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date(2026, 2, 15);
    var ms = date.setDate(20);
    document.getElementById("out").textContent =
      "Returned ms: " + ms + "\n" +
      "getTime() matches: " + (ms === date.getTime());
  </script>
</body>
</html>

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JavaScript Date setDate() — return value (Try It)