Editing ISO 8601 (section)

=== RFCs ===
IETF RFC 3339<ref>{{cite IETF |title=Date and Time on the Internet: Timestamps |date=July 2002 |last1=Newman |first1=Chris |last2=Klyne |first2=Graham |rfc=3339 |access-date=2015-10-25 |publisher=[[Internet Engineering Task Force|IETF]] }}</ref> defines a profile of ISO&nbsp;8601 for use in [[Internet protocol suite|Internet protocols]] and [[Internet standard|standards]]. It explicitly excludes durations and dates before the [[common era]]. The more complex formats such as week numbers and ordinal days are not permitted.<ref>{{cite IETF |title=Date and Time on the Internet: Timestamps|rfc=3339|section=5.6|sectionname=Internet Date/Time Format | page=8 |date=July 2002 |last1=Newman |first1=Chris |last2=Klyne |first2=Graham  |access-date=2015-10-25 |publisher=[[Internet Engineering Task Force|IETF]]}}</ref>

<nowiki>RFC 3339</nowiki> deviates from ISO&nbsp;8601 in allowing a zero time zone offset to be specified as "-00:00", which ISO&nbsp;8601 forbids. <nowiki>RFC 3339</nowiki> intends "-00:00" to carry the connotation that it is not stating a preferred time zone, whereas the conforming "+00:00" or any non-zero offset connotes that the offset being used is preferred. This convention regarding "-00:00" is derived from earlier RFCs, such as RFC 2822 which uses it for timestamps in [[email]] headers.<ref>{{cite IETF |title=Internet Message Format |rfc=2822 |sectionname=Date and Time Specification |section=3.3 |page=14 |date=April 2001 |publisher=[[Internet Engineering Task Force|IETF]]}}</ref> <nowiki>RFC 2822</nowiki> made no claim that any part of its timestamp format conforms to ISO&nbsp;8601, and so was free to use this convention without conflict.

Building upon the foundations of RFC 3339, the [[Internet Engineering Task Force|IETF]] introduced the Internet Extended Date/Time Format (IXDTF) in RFC 9557.<ref>{{cite IETF |title=Date and Time on the Internet: Timestamps with Additional Information|rfc=9557 |date=2024 |last1=Sharma |first1=Ujjwal |last2=Bormann |first2=Carsten  |access-date=2024-05-28 |publisher=[[Internet Engineering Task Force|IETF]] }}</ref> This format extends the timestamp representation to include additional information such as an associated time zone name. The inclusion of time zone names is particularly useful for applications that need to account for events like daylight saving time transitions. Furthermore, IXDTF maintains compatibility with pre-existing syntax for attaching time zone names to timestamps, providing a standardized and flexible approach to timestamp representation on the internet. Example:

<code>1996-12-19T16:39:57-08:00[America/Los_Angeles]</code>