RFC 3339
technicalEmbed This Widget
Add the script tag and a data attribute to embed this widget.
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<timefyi-glossary slug="rfc-3339"></timefyi-glossary>Definition
An internet standard for date and time representation, based on ISO 8601 but stricter. Requires the 'T' separator and timezone offset (e.g., '2026-02-25T10:30:00+09:00'). Widely used in REST APIs.