RFC 3339
technicalEmbed This Widget
Add the script tag and a data attribute to embed this widget.
<script src="https://cdn.jsdelivr.net/npm/timefyi-embed@1/dist/embed.min.js" defer></script>
<div data-timefyi="glossary" data-slug="rfc-3339"></div>Embed via iframe for maximum compatibility.
<iframe src="https://timefyi.com/iframe/glossary/rfc-3339/" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://timefyi.com/glossary/rfc-3339/Add a dynamic SVG badge to your README or docs.
[](https://timefyi.com/glossary/rfc-3339/)Use the native HTML custom element.
<script src="https://cdn.jsdelivr.net/npm/timefyi-embed@1/dist/embed.min.js" defer></script>
<timefyi-glossary slug="rfc-3339"></timefyi-glossary>定義
ISO 8601に基づくインターネット標準の日付・時刻表現形式で、より厳格。'T'区切り文字とタイムゾーンオフセット（例：'2026-02-25T10:30:00+09:00'）が必須。REST APIで広く使用される。