Source / pinned edition
Date and Time on the Internet: Timestamps with Additional Information
Source of package ietf.timestamps · RFC 9557
- work
- urn:ietf:clir:timestamps#RFC9557
- number
- RFC 9557
- kind
- urn:ietf:clir:timestamps#standards_track
RFC 9557, April 2024
- edition
- urn:ietf:clir:timestamps#RFC9557_EN
- language
- en
- officiality
- official
- materialisation
- PINNED_OFFICIAL_BYTES
- life cycle
- adopted: 2024-04-01; in_force: [object Object]
Publications
| URI | Type | documentHash | Retrieved |
|---|---|---|---|
| https://www.rfc-editor.org/rfc/rfc9557.txt | text/plain; charset=us-ascii | sha256:87fa632cd75d13aa441859da635ed6618f66d203fe71a30fa85afedbeb149e85 | 2026-09-04T22:30:00Z |
Fragments — 2
section/2_2 · section · referenced by: 2
en · official · sha256:e7b74600b1a2a5938e6f9f5c124872f4c20536a3a00d94ade07bd4a3515417ce
2.2. Update to RFC 3339
This specification updates Section 4.3 of [RFC3339], aligning it with
the actual practice of interpreting the offset Z to mean the same as
-00:00: "the time in UTC is known, but the offset to local time is
unknown".
Section 4.3 of [RFC3339] is revised to read as follows:
| If the time in UTC is known, but the offset to local time is
| unknown, this can be represented with an offset of "Z". (The
| original version of this specification provided -00:00 for this
| purpose, which is not allowed by [ISO8601:2000] and therefore is
| less interoperable; Section 3.3 of [RFC5322] describes a related
| convention for email, which does not have this problem). This
| differs semantically from an offset of +00:00, which implies that
| UTC is the preferred reference point for the specified time.Referencing norms: OffsetMeaningIsUnique, ZuluMeansUnknownOffsetAfterRfc9557
section/2_3 · section · referenced by: 1
en · official · sha256:38a266f389f2446bbc10e7f4b5e536becbac24d3c71ec61c2adcf4aa8d3cfb21
2.3. Notes
Note that the semantics of the local offset +00:00 is not updated;
this retains the implication that UTC is the preferred reference
point for the specified time.Referencing norms: PositiveZeroMeansUtcPreferred
The hash beside the text is the sha256 of its exact bytes. It is the check that the text shown matches the one pinned in the package: a divergence fails the oracle’s static analysis.