HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>max — date input</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}label{display:block;margin-bottom:.35rem;font-weight:500;font-size:.875rem}input{width:100%;max-width:280px;padding:.5rem .65rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>max on &lt;input type="date"&gt;</h1>
  <label for=eventDate>Event date (no later than 2025-12-31):</label>
  <input type=date id=eventDate name=eventDate max=2025-12-31>
  <p class=hint><code>max="2025-12-31"</code> prevents picking dates after December 31, 2025 in supporting browsers.</p>
</body>
</html>

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HTML max Attribute — Date Input Deadline