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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>toISOString() — slice</title>
</head>
<body>
  <h1>ISO string and YYYY-MM-DD</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var event = new Date("05 October 2011 14:48 UTC");
      var lines = [
        event.toISOString(),
        event.toISOString().slice(0, 10)
      ];
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Date toISOString() — YYYY-MM-DD slice (Try It)