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auto-ingest: ietf-elements backfill — 120 new elements (2026-07-12)
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document: rfc-3339
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kind: design-rationale
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summary: An offset of "-00:00" indicates the UTC time is known but the local offset is unknown, distinguishing it semantically from "+00:00" or "Z" which imply UTC is the preferred reference point.
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section: "4.3"
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-12"
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document: rfc-3339
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kind: design-rationale
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summary: Components are ordered from least precise (year) to most precise (second/fraction), so that timestamps sharing the same time zone string and fractional-second precision can be correctly sorted using a simple lexicographic string comparison (e.g., strcmp()).
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section: "5.1"
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-12"
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document: rfc-3339
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kind: design-rationale
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summary: Day-of-week is deliberately excluded from the format because it is redundant (computable from the date) and its inclusion would introduce the possibility of inconsistency between the day-of-week field and the calendar date.
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section: "5.4"
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-12"
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document: rfc-3339
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kind: design-rationale
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summary: Fractions of a second are the sole rarely-used option retained in the format, expected only for applications requiring strict ordering or unusual precision. Rarely used options are avoided because they are less likely to be tested and bugs in parsing are more likely to remain undiscovered.
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section: "5.3"
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-12"
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document: rfc-3339
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kind: design-rationale
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summary: The full ISO 8601 grammar is too complex for Internet use; this profile achieves simplicity by making most fields and punctuation mandatory, leaving fractions of a second as the only optional element.
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section: "5.5"
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-12"
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document: rfc-3339
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kind: design-rationale
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summary: UTC is preferred over local time because daylight saving rules are convoluted and can change unpredictably based on local law; true interoperability is best achieved with UTC. This specification explicitly does not address local timezone rule handling.
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summary: UTC is preferred over local time because daylight saving rules are convoluted and can change at unpredictable times based on local law, making true interoperability unachievable with local time zones alone.
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section: "4.1"
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-05"
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extracted_at: "2026-07-12"
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document: rfc-3339
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kind: interoperability-note
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summary: Attempts to label local UTC offsets with alphabetic timezone strings (as in old RFC 822) resulted in poor interoperability. RFC 2822 made numeric offsets mandatory; this profile follows the same approach.
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section: "4.2"
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topics:
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- email
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-12"
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document: rfc-3339
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kind: interoperability-note
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summary: Historical time zones that differ from UTC by a non-integral number of minutes (e.g., Netherlands mean time, +00:19:32.13) cannot be represented exactly in the HH:MM numeric offset format; applications must convert to the closest representable offset.
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summary: Historical time zones that differ from UTC by a non-integral number of minutes (e.g., the Netherlands in 1937, at +00:19:32.13) cannot be represented exactly in HH:MM format; applications must convert such timestamps to the closest representable UTC offset.
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section: "4.2"
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-06-21"
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extracted_at: "2026-07-12"
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document: rfc-3339
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kind: interoperability-note
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summary: Internet clients SHOULD be prepared to transform RFC 3339 timestamps into a display format suitable for the user's locality, including translating UTC to local time, because no single date/time format is readable according to the conventions of all countries.
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section: "5.2"
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rfc2119_level: SHOULD
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-12"
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document: rfc-3339
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kind: interoperability-note
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summary: Leap seconds occur simultaneously in all time zones; in non-UTC zones the leap second point is shifted by the zone offset so that it happens at the same instant globally.
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summary: Leap seconds occur simultaneously in all time zones; in non-UTC zones the leap second point is shifted by the zone offset. A leap second in UTC (XXXX-MM-DDT23:59:60Z) appears at a different local clock time but represents the same instant.
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section: "5.7"
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-05-23"
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extracted_at: "2026-07-12"

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