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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Date valueOf()</title>
</head>
<body>
  <h1>Basic valueOf()</h1>
  <pre id="out"></pre>
  <script>
    var date = new Date("2026-03-15T12:00:00.000Z");
    document.getElementById("out").textContent =
      date.valueOf() + "\n" + date.toISOString();
  </script>
</body>
</html>

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JavaScript Date valueOf() — basic timestamp (Try It)