Editing ISO 8601 (section)

==Usage==
On the [[Internet]], the [[World Wide Web Consortium]] (W3C) uses the [[IETF]] standard based on ISO&nbsp;8601 in defining a profile of the standard that restricts the supported date and time formats to reduce the chance of error and the complexity of software. The very simple specification is based on a draft of the <nowiki>RFC 3339</nowiki> mentioned below.<ref>[http://www.w3.org/TR/NOTE-datetime Note about Date and Time Formats to W3C from Reuters] {{Webarchive|url=https://web.archive.org/web/20110824114114/http://www.w3.org/TR/NOTE-datetime |date=2011-08-24 }}<!--should be XML Schema--></ref>

ISO&nbsp;8601 is referenced by several specifications, but the full range of options of ISO&nbsp;8601 is not always used. For example, the various [[electronic program guide]] standards for TV, digital radio, etc. use several forms to describe points in time and durations. The [[ID3]] audio meta-data specification also makes use of a subset of ISO&nbsp;8601.<ref>{{Cite web |last=Nilsson |first=M. |date=2000-11-01 |title=ID3 tag version 2.4.0 - Main Structure |url=http://www.id3.org/id3v2.4.0-structure |archive-url=https://web.archive.org/web/20150309021728/http://id3.org/id3v2.4.0-structure |archive-date=2015-03-09 |access-date=2009-09-27 |publisher=id3.org |pages=§4}}</ref>
The [[X.690]] encoding standard's [[GeneralizedTime]] makes use of another subset of ISO&nbsp;8601.

=== Commerce ===
As of 2006, the [[ISO week date]] appears in its basic form on major brand commercial packaging in the United States.{{Citation needed|date=March 2023}} Its appearance depended on the particular packaging, canning, or bottling plant more than any particular brand. The format is particularly useful for quality assurance, so that production errors can be readily traced.

=== 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>

=== Adoption as national standards ===
<!-- If possible, please specify revisions and release dates as well. In order to establish some chronology, older standards can be listed as well, but only if they were related to ISO 8601 already. -->
{| class="wikitable"
|-
! style="text-align:left" | Australia 
| AS/NZS ISO 8601.1:2021, AS/NZS ISO 8601.2:2021 (replaced AS ISO 8601-2007)
|-
! style="text-align:left" | Austria 
| ÖNORM ISO 8601 (replaced ÖNORM EN 28601)
|-
! style="text-align:left" | Belgium 
| NBN EN 28601 (1993)
|-
! style="text-align:left" | Brazil 
| NBR 5892:2019
|-
! style="text-align:left" | Canada 
| ISO 8601-1:2019/Amd 1:2022<ref>National Standard of Canada, {{Cite web |date=2022-10-24  |title=ISO 8601-1:2019/Amd 1:2022: Date and time — Representations for information interchange |url=https://scc-ccn.ca/standardsdb/standards/8179166 |access-date=2025-03-22 |website=Standards Council of Canada |language=en}}</ref>
|-
! style="text-align:left" | Colombia 
| NTC 1034:2014<ref>[https://tienda.icontec.org/gp-elementos-de-datos-y-formatos-de-intercambio-intercambio-de-informacion-representacion-de-fechas-y-horas-ntc1034-2014.html Source ICONTEC (This standard is identical to ISO 8601:2004)] {{Webarchive|url=https://web.archive.org/web/20200116023212/https://tienda.icontec.org/wp-content/uploads/pdfs/NTC1034.pdf |date=2020-01-16 }}</ref>
|-
! style="text-align:left" | China 
| GB/T 7408-2005
|-
! style="text-align:left" | Czech Republic 
| ČSN ISO 8601 (replaced ČSN EN 28601) (Obsolete as of 2019. No standard was given in exchange.<ref>{{Cite web |date=2023-04-17 |title=ČSN ISO 8601 (979738) Datové prvky a formáty výměny - Výměna informací - Zobrazení data a času |url=https://www.technicke-normy-csn.cz/csn-iso-8601-979738-241001.html |access-date=2023-04-17}}</ref>)
|-
! style="text-align:left" | Denmark 
| DS/ISO 8601:2005 (replaced DS/EN 28601)
|-
! style="text-align:left" | Estonia 
| EVS 8:2008; EVS-ISO 8601:2011
|-
! style="text-align:left" | [[European Norm]] 
| EN ISO 8601, EN 28601:1992 (cancelled 7 October 2011)
|-
! style="text-align:left" | Finland 
| SFS-EN 28601
|-
! style="text-align:left" | France 
| NF Z69-200; NF EN 28601:1993-06-01 (cancelled)
|-
! style="text-align:left" | Germany 
| DIN ISO 8601:2006-09 (replaced DIN EN 28601:1993-02); related: DIN 5008:2011-04 (replaced DIN 5008:2005-05, DIN 5008:2001-11, DIN 5008:1996-05)
|-
! style="text-align:left" | Greece 
| ELOT EN 28601
|-
! style="text-align:left" | Hungary 
| MSZ ISO 8601:2003
|-
! style="text-align:left" | Iceland 
| IST EN 28601:1992 (obsolete)
|-
! style="text-align:left" | [[India]] 
| IS 7900:2001
|-
! style="text-align:left" | Ireland 
| IS/EN 28601:1993
|-
! style="text-align:left" | Italy 
| UNI EN 28601 (1993)
|-
! style="text-align:left" | Japan 
| JIS X 0301:2002
|-
! style="text-align:left" | Korea, Republic of 
| KS X ISO 8601
|-
! style="text-align:left" | Lithuania 
| LST ISO 8601:2006 (replaced LST ISO 8601:1997)
|-
! style="text-align:left" | Luxembourg 
| ITM-EN 28601
|-
! style="text-align:left" | Mexico 
| NMX-CH-150-IMNC-1999<ref>{{Cite web |title=DOF - Diario Oficial de la Federación |url=http://dof.gob.mx/nota_detalle_popup.php?codigo=2052016 |url-status=live |archive-url=https://web.archive.org/web/20211110203252/http://dof.gob.mx/nota_detalle_popup.php?codigo=2052016 |archive-date=2021-11-10 |access-date=2021-11-10}}</ref>
|-
! style="text-align:left" | Netherlands 
| NEN ISO 8601, NEN EN 28601 (1994), NEN 2772
|-
! style="text-align:left" | New Zealand
| AS/NZS ISO 8601.1:2021, AS/NZS ISO 8601.2:2021
|-
! style="text-align:left" | Norway 
| NS-ISO 8601
|-
! style="text-align:left" | Poland 
| PN-EN 28601:2002 (Obsolete as of 2008. No standard was given in exchange.<ref>{{Cite web |last=Czubla |first=Albin |date=2020-12-04 |title=Główny Urząd Miar |url=https://www.gum.gov.pl/pl/aktualnosci/komunikaty/471,Numerowanie-tygodni-w-roku.pdf |access-date=2020-12-04 |website=Główny Urząd Miar}}</ref>)
|-
! style="text-align:left" | Portugal 
| NP EN 28601
|-
! style="text-align:left" | Russia 
| ГОСТ ИСО 8601-2001 (current), ГОСТ 7.64-90 (obsolete)
|-
! style="text-align:left" | South Africa 
| SANS 8601:2009<ref>{{Cite web |title=SANS 8601:2009 (Ed. 2.00) |url=https://store.sabs.co.za/catalog/product/view/id/216987/s/sans-8601-2009-ed-2-00/ |url-status=live |archive-url=https://web.archive.org/web/20211124053222/https://store.sabs.co.za/catalog/product/view/id/216987/s/sans-8601-2009-ed-2-00/ |archive-date=2021-11-24 |access-date=2021-11-24 |website=SABS Webstore}}</ref>
|-
! style="text-align:left" | Spain 
| UNE EN 28601:1995
|-
! style="text-align:left" | Sweden 
| SS-ISO 8601-1:2022,<ref>{{Cite web |title=SS-ISO 8601-1:2022 |url=https://www.sis.se/en/produkter/standardization/information-sciences-publishing/documents-in-administration-commerce-and-industry/ss-iso-8601-12022/ |access-date=2023-10-06 |website=SIS Webstore}}</ref> contains the official English version of ISO 8601-1:2019. (Approved 2022-05-13, replaces SS-ISO 8601:2011, edition 2)
|-
! style="text-align:left" | Switzerland 
| SN ISO 8601:2005-08 (replaced SN-EN 28601:1994)
|-
! style="text-align:left" | Taiwan 
| CNS 7648
|-
! style="text-align:left" | Thailand 
| TIS 1111:2535 (1992)
|-
! style="text-align:left" | [[Turkey]]
| [https://intweb.tse.org.tr/Standard/Standard/Standard.aspx?081118051115108051104119110104055047105102120088111043113104073099090081121118054048055097110084 TS ISO 8601-1] and [https://intweb.tse.org.tr/Standard/Standard/Standard.aspx?081118051115108051104119110104055047105102120088111043113104073088120070088100073077122088115098 TS ISO 8601-2] (Accepted from 2021-02-15)
|-
! style="text-align:left" | Ukraine 
| ДСТУ ISO 8601:2010
|-
! style="text-align:left" | United Kingdom 
| BS ISO 8601:2004, BS EN 28601 (1989-06-30)
|-
! style="text-align:left" | United States 
| ANSI INCITS 30-1997 (R2008) and NIST FIPS PUB 4-2
|-
! style="text-align:left" | Vietnam 
| [https://thuvienphapluat.vn/TCVN/linh-vuc-khac/tcvn-6398-1-1998-dai-luong-va-don-vi-khong-gian-va-thoi-gian-907037.aspx TCVN 6398-1:1998]
|}