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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>cloneDeepWith — dates</title>
</head>
<body>
  <h1>Customize Date values</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var source = {
      label: "ship",
      when: new Date("2026-01-15T00:00:00.000Z")
    };
    var copy = _.cloneDeepWith(source, function (value) {
      if (value instanceof Date) {
        return value.toISOString();
      }
    });
    document.getElementById("out").textContent = JSON.stringify(copy);
  </script>
</body>
</html>

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Lodash _.cloneDeepWith — customize Dates (Try It)