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  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>datetime JavaScript Example</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}time{display:block;padding:.75rem 1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px;max-width:420px;font-family:ui-monospace,monospace;font-size:.875rem}p{margin-top:1rem;font-size:.875rem;color:#64748b;max-width:420px}</style>

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  <h1>Current date and time</h1>

  <time id=dynamicTime>Loading…</time>



  <script>var el=document.getElementById("dynamicTime"),iso=(new Date).toISOString();el.dateTime=iso,el.textContent=iso</script>



  <p><code>dateTime</code> (capital T in JavaScript) stores the machine-readable value. <code>toISOString()</code> returns UTC format with a <code>Z</code> suffix.</p>

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HTML datetime Attribute — JavaScript Update