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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>toJSON vs ISO</title>

</head>

<body>

  <h1>toJSON vs toISOString</h1>

  <pre id="out"></pre>

  <script>

    var date = new Date(Date.UTC(2026, 2, 15, 12, 0, 0));

    document.getElementById("out").textContent =

      date.toJSON() + "\n" +

      date.toISOString() + "\n" +

      (date.toJSON() === date.toISOString());

  </script>

</body>

</html>

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JavaScript Date toJSON() — vs toISOString (Try It)