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2026-09-17 22:10:03 +00:00

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<meta name="description" content="Render an instant as text using a token pattern.">
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-datetime.html">DateTime</a> <span>›</span> <span class="here">DateTime.format</span></div>
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<span class="kind-badge kind-method">method</span>
<h1 id="top">DateTime.format</h1>
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<code class="sig">DateTime.format(dt, pattern) -&gt; string</code>
<div class="desc"><p>Renders the instant <code>dt</code> as a string, filling the tokens in <code>pattern</code> with zero-padded fields and copying every other character through verbatim. The pattern <b>must be a string literal</b> &mdash; it is expanded at compile time, so there is no runtime pattern scanner. Recognised tokens: <code>YYYY</code> (4-digit year), <code>YY</code> (2-digit year), <code>MM</code> (month), <code>DD</code> (day), <code>HH</code> (hour, 24h), <code>mm</code> (minute), <code>ss</code> (second).</p></div>
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Demo {
handler Step phase Update {
let t = DateTime.from(2026, 8, 30, 7, 5, 9)
let stamp = DateTime.format(t, "YYYY-MM-DD HH:mm:ss") # "2026-08-30 07:05:09"
}
}</pre></div>
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