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The Clock That Didn't Match

This component intermittently throws a hydration mismatch in a Next.js SSR environment.

REACT_MODULE // 0x42
export default function Timestamp() {
  const now = new Date().toLocaleTimeString();
  return <p>Rendered at: {now}</p>;
}

What is the root cause of "Text content does not match server-rendered HTML"?

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