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RFC 9557: Date and Time on the Internet: Timestamps with Additional Information
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".
However, the time zone hint given in the suffix tag is elective, so the recipient is not required to act on the inconsistency; it can treat the Internet Date/Time Format string as if it were: ¶ each have an internal inconsistency or an unrecognized suffix key/value that is marked as critical, so a recipient MUST treat these IXDTF strings as erroneous. This means that the application MUST reject the data or perform some other error handling, such as asking the user how to resolve the inconsistency (see Section 3.4).
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