RFC 9557: Date and Time on the Internet: Timestamps with Additional Information
In plain English — editorial summary, not part of the RFC
This document defines an extension to the timestamp format defined in RFC 3339 for representing additional information, including a time zone. It updates RFC 3339 in the specific interpretation of the local offset Z, which is no longer understood to "imply that UTC is the preferred reference point for the specified time".
Document record
- Document ID
- RFC9557
- Published
- April 2024
- Authors
- U. Sharma; C. Bormann
- Status
- PROPOSED STANDARD
- Stream
- IETF
- Area
- art
- Pages
- 17
- Also known as
- —
- Updates:
- RFC 3339
Topics
Related documents
Ranked automatically by shared keywords, IETF area and stream — not by editorial selection.
- RFC 7809Calendaring Extensions to WebDAV (CalDAV): Time Zones by ReferenceCurrent
March 2016
- RFC 7808Time Zone Data Distribution ServiceCurrent
March 2016
- RFC 9636The Time Zone Information Format (TZif)Current
October 2024
- RFC 9422The LIMITS SMTP Service ExtensionCurrent
February 2024
- RFC 9343IPv6 Application of the Alternate-Marking MethodCurrent
December 2022
- RFC 9809X.509 Certificate Extended Key Usage (EKU) for Configuration, Updates, and Safety-Critical CommunicationCurrent
July 2025
- RFC 88030-RTT TCP Convert ProtocolCurrent
July 2020
- RFC 8536The Time Zone Information Format (TZif)Obsoleted
February 2019
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The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.
Last checked against the RFC Editor index on . RFCs are never revised after publication; changes are issued as new documents.
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