Date and Time on the Internet: Timestamps with Additional Information
RFC 9557, “Date and Time on the Internet: Timestamps with Additional Information”, is a Proposed Standard document published in April 2024 by U. Sharma, C. Bormann. It updates RFC 3339. The canonical text is published by the RFC Editor.
Abstract
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".
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9557 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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