rfc-2445 - Revision history

D: Added a bunch more information about iCalendar and its recent evolution

2025-01-30T14:35:29Z

Added a bunch more information about iCalendar and its recent evolution

← Older revision		Revision as of 14:35, 30 January 2025
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	{{warning\|This page needs to be updated to be based on RFC 5445, moving old content to a History section for the legacy impact of 2445 on original hCalendar design etc.}}		{{warning\|This page needs to be updated to be based on RFC 5445, moving old content to a History section for the legacy impact of 2445 on original hCalendar design etc.}}

	~~[http://www~~.~~ietf.org/rfc/rfc2445.txt RFC 2445]~~, "Internet ~~Calendaring~~ and ~~Scheduling Core Object Specification (iCalendar)"~~, ~~commonly referred~~ to as iCalendar ~~or iCal~~, formed the basis of the ~~[[hcalendar\|hCalendar]] microformat~~.		iCalendar is a specification maintained by the IETF Calendaring Extensions (calext) Working Group, and is a widely used standard for the storage and exchange of calendar information. It was originally specified, as "vCalendar", by the Versit Consortium, before being passed to the Internet Mail Consortium, and finally adopted by the IETF. The second revision of the standard, renamed to iCalendar, has formed the basis of many calendaring applications for decades. Recent work within the IETF has proposed both new JSON-based syntax, as well as revised and extended semantics.

			The core iCalendar objects include: events, todos, journal entries, and supporting timezone data. These definitions formed the semantic basis for the [[hcalendar\|hCalendar]] microformat.

			== History ==

			* [https://cs.brown.edu/courses/cs190/old.spr1998/projects/acms/vCalendar_specs.pdf vCalendar] The original vCalendar specification, no longer in significant use.
			* [http://www.ietf.org/rfc/rfc2445.txt RFC 2445], "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", from 1998, defines the iCalendar 2.0 format, the basis for [[hcalendar\|hCalendar]].
			* [http://www.ietf.org/rfc/rfc5445.txt RFC 5445], "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", from 2009, updates and replaces RFC 2445.
			* [http://www.ietf.org/rfc/rfc6321.txt RFC 6321], "xCal: The XML Format for iCalendar", from 2011, maps the iCalendar syntax to XML.
			* [http://www.ietf.org/rfc/rfc7265.txt RFC 7265], "jCal: The JSON Format for iCalendar", from 2014, maps the iCalendar syntax to JSON.
			* [http://www.ietf.org/rfc/rfc7529.txt RFC 7529], "Non-Gregorian Recurrence Rules in the Internet Calendaring and Scheduling Core Object Specification (iCalendar)", from 2015, extends iCalendar.
			* [http://www.ietf.org/rfc/rfc7953.txt RFC 7953], "Calendar Availability", from 2016, extends iCalendar with free/busy components for public scheduling.
			* [http://www.ietf.org/rfc/rfc7986.txt RFC 7986], "New Properties for iCalendar", from 2016, extends iCalendar.
			* [http://www.ietf.org/rfc/rfc9074.txt RFC 9074], "'VALARM' Extensions for iCalendar", from 2021, extends iCalendar to support alarms.
			* [http://www.ietf.org/rfc/rfc9253.txt RFC 9253], "Support for iCalendar Relationships", from 2022, extends iCalendar to support relationships between calendar objects.

			As of 2025, work in the IETF continues on a revised JSON format (JSCalendar), guidelines for conversion from iCalendar to JSCalendar (potentially valuable for microformats), revisions to tasks, extensions for polling and subscription, and more.

			== References ==
	When normatively referencing <nowiki>RFC 2445</nowiki> on this wiki, either do so by linking to this page with:		When normatively referencing <nowiki>RFC 2445</nowiki> on this wiki, either do so by linking to this page with:
	<nowiki>{{RFC2445}}</nowiki>		<nowiki>{{RFC2445}}</nowiki>
	or directly to http://www.ietf.org/rfc/rfc2445.txt.		or directly to http://www.ietf.org/rfc/rfc2445.txt.

	== ~~validator~~ ==		Avoid linking to the informative HTML translation of rfc2445.txt, which you must explicitly do by avoiding simply using the string <nowiki>RFC 2445</nowiki> in your text, as MediaWiki appears to auto-hyperlink it to the HTML translation thus: RFC 2445.

			== Validator ==
	* https://icalendar.org/validator.html		* https://icalendar.org/validator.html
	** [https://icalendar.org/More-Info/about-the-icalendar-validator.html About the validator.] (initial version launched in June 2015)		** [https://icalendar.org/More-Info/about-the-icalendar-validator.html About the validator.] (initial version launched in June 2015)

	== ~~alternate references ==~~		== See Also ==
	Avoid linking to the informative HTML translation of rfc2445.txt, which you must explicitly do by avoiding simply using the string <nowiki>RFC 2445</nowiki> in your text, as MediaWiki appears to auto-hyperlink it to the HTML translation thus: RFC 2445.

	~~== previous versions ==~~
	~~=== vCalendar ===~~
	~~[http://www.imc.org/pdi/vcal-10.txt vCalendar], sometimes referred to as "iCal 1.0", or vCal.~~

	~~== see also~~ ==
	* [[icalendar-errata\|iCalendar errata]]		* [[icalendar-errata\|iCalendar errata]]
	* [[icalendar-implementations\|iCalendar implementations]]		* [[icalendar-implementations\|iCalendar implementations]]
	* [[icalendar-issues\|iCalendar issues]]		* [[icalendar-issues\|iCalendar issues]]
	* [[hcalendar\|hCalendar]]		* [[hcalendar\|hCalendar]]

Aaronpk: Replace with {{DISPLAYTITLE:}}

2020-07-18T16:32:49Z

Replace <entry-title> with {{DISPLAYTITLE:}}

← Older revision		Revision as of 16:32, 18 July 2020
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	~~<entry-title>~~iCalendar RFC 2445~~</entry-title>~~		{{DISPLAYTITLE:iCalendar RFC 2445}}

	{{warning\|This page needs to be updated to be based on RFC 5445, moving old content to a History section for the legacy impact of 2445 on original hCalendar design etc.}}		{{warning\|This page needs to be updated to be based on RFC 5445, moving old content to a History section for the legacy impact of 2445 on original hCalendar design etc.}}

Tantek: /* validator */ about, launched 2015

2019-12-16T22:27:03Z

validator: about, launched 2015

← Older revision		Revision as of 22:27, 16 December 2019
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	== validator ==		== validator ==
	* https://icalendar.org/validator.html		* https://icalendar.org/validator.html
			** [https://icalendar.org/More-Info/about-the-icalendar-validator.html About the validator.] (initial version launched in June 2015)

	== alternate references ==		== alternate references ==

Tantek: needs update to 5445, note validator

2019-12-16T22:23:16Z

needs update to 5445, note validator

← Older revision		Revision as of 22:23, 16 December 2019
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	<entry-title>iCalendar RFC 2445</entry-title>		<entry-title>iCalendar RFC 2445</entry-title>

	[http://www.ietf.org/rfc/rfc2445.txt RFC 2445], "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", commonly referred to as iCalendar or iCal, ~~forms~~ the basis of the [[hcalendar\|hCalendar]] microformat.		{{warning\|This page needs to be updated to be based on RFC 5445, moving old content to a History section for the legacy impact of 2445 on original hCalendar design etc.}}

			[http://www.ietf.org/rfc/rfc2445.txt RFC 2445], "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", commonly referred to as iCalendar or iCal, formed the basis of the [[hcalendar\|hCalendar]] microformat.

	When normatively referencing <nowiki>RFC 2445</nowiki> on this wiki, either do so by linking to this page with:		When normatively referencing <nowiki>RFC 2445</nowiki> on this wiki, either do so by linking to this page with:
	<nowiki>{{RFC2445}}</nowiki>		<nowiki>{{RFC2445}}</nowiki>
	or directly to http://www.ietf.org/rfc/rfc2445.txt.		or directly to http://www.ietf.org/rfc/rfc2445.txt.

			== validator ==
			* https://icalendar.org/validator.html

	== alternate references ==		== alternate references ==

TomMorris: adding issues page

2014-05-12T19:30:42Z

adding issues page

← Older revision		Revision as of 19:30, 12 May 2014
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	* [[icalendar-errata\|iCalendar errata]]		* [[icalendar-errata\|iCalendar errata]]
	* [[icalendar-implementations\|iCalendar implementations]]		* [[icalendar-implementations\|iCalendar implementations]]
			* [[icalendar-issues\|iCalendar issues]]
	* [[hcalendar\|hCalendar]]		* [[hcalendar\|hCalendar]]

Tantek: entry-title fix

2013-01-23T16:39:24Z

entry-title fix

← Older revision		Revision as of 16:39, 23 January 2013
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	<entry-title>iCalendar ~~<nowiki>~~RFC 2445~~</nowiki>~~</entry-title>		<entry-title>iCalendar RFC 2445</entry-title>

	[http://www.ietf.org/rfc/rfc2445.txt RFC 2445], "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", commonly referred to as iCalendar or iCal, forms the basis of the [[hcalendar\|hCalendar]] microformat.		[http://www.ietf.org/rfc/rfc2445.txt RFC 2445], "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", commonly referred to as iCalendar or iCal, forms the basis of the [[hcalendar\|hCalendar]] microformat.

Tantek: linking to plain txt version is a deliberate choice as noted in the text of this page, Undo revision 49689 by Zearin (Talk), entry-title, auto-toc

2013-01-23T16:38:44Z

linking to plain txt version is a deliberate choice as noted in the text of this page, Undo revision 49689 by Zearin (Talk), entry-title, auto-toc

← Older revision		Revision as of 16:38, 23 January 2013
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	<h1>iCalendar <nowiki>RFC 2445</nowiki></h1>		<entry-title>iCalendar <nowiki>RFC 2445</nowiki></entry-title>
	~~{{TOC-right}}~~
	[http://~~tools~~.ietf.org/~~html~~/rfc2445 RFC 2445], "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", commonly referred to as iCalendar or iCal, forms the basis of the [[hcalendar\|hCalendar]] microformat.		[http://www.ietf.org/rfc/rfc2445.txt RFC 2445], "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", commonly referred to as iCalendar or iCal, forms the basis of the [[hcalendar\|hCalendar]] microformat.

	When normatively referencing <nowiki>RFC 2445</nowiki> on this wiki, either do so by linking to this page with:		When normatively referencing <nowiki>RFC 2445</nowiki> on this wiki, either do so by linking to this page with:
	<nowiki>{{RFC2445}}</nowiki>		<nowiki>{{RFC2445}}</nowiki>
	or directly to http://~~tools~~.ietf.org/~~html~~/rfc2445.		or directly to http://www.ietf.org/rfc/rfc2445.txt.

	== alternate references ==		== alternate references ==

Zearin: Use the hypertext version of RFC documents

2013-01-23T15:44:22Z

Use the hypertext version of RFC documents

← Older revision		Revision as of 15:44, 23 January 2013
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	<h1>iCalendar <nowiki>RFC 2445</nowiki></h1>		<h1>iCalendar <nowiki>RFC 2445</nowiki></h1>
	{{TOC-right}}		{{TOC-right}}
	[http://~~www~~.ietf.org/~~rfc~~/rfc2445~~.txt~~ RFC 2445], "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", commonly referred to as iCalendar or iCal, forms the basis of the [[hcalendar\|hCalendar]] microformat.		[http://tools.ietf.org/html/rfc2445 RFC 2445], "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", commonly referred to as iCalendar or iCal, forms the basis of the [[hcalendar\|hCalendar]] microformat.

	When normatively referencing <nowiki>RFC 2445</nowiki> on this wiki, either do so by linking to this page with:		When normatively referencing <nowiki>RFC 2445</nowiki> on this wiki, either do so by linking to this page with:
	<nowiki>{{RFC2445}}</nowiki>		<nowiki>{{RFC2445}}</nowiki>
	or directly to http://~~www~~.ietf.org/~~rfc~~/rfc2445~~.txt~~.		or directly to http://tools.ietf.org/html/rfc2445.

	== alternate references ==		== alternate references ==

AndyMabbett: ext link has icon

2008-01-07T17:51:22Z

ext link has icon

← Older revision		Revision as of 17:51, 7 January 2008
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	== alternate references ==		== alternate references ==
	Avoid linking to the informative HTML translation of rfc2445.txt, which you must explicitly do by avoiding simply using RFC 2445 ~~(like that)~~ in your text, as MediaWiki appears to auto-hyperlink it to the HTML translation.		Avoid linking to the informative HTML translation of rfc2445.txt, which you must explicitly do by avoiding simply using the string <nowiki>RFC 2445</nowiki> in your text, as MediaWiki appears to auto-hyperlink it to the HTML translation thus: RFC 2445.

	== previous versions ==		== previous versions ==

AndyMabbett: template

2008-01-07T17:43:54Z

template

← Older revision		Revision as of 17:43, 7 January 2008
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	When normatively referencing <nowiki>RFC 2445</nowiki> on this wiki, either do so by linking to this page with:		When normatively referencing <nowiki>RFC 2445</nowiki> on this wiki, either do so by linking to this page with:
	<nowiki>~~[[rfc-2445\|~~RFC2445]]</nowiki>		<nowiki>{{RFC2445}}</nowiki>
	or directly to http://www.ietf.org/rfc/rfc2445.txt.		or directly to http://www.ietf.org/rfc/rfc2445.txt.

← Older revision		Revision as of 19:30, 12 May 2014
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	* [[icalendar-errata\|iCalendar errata]]		* [[icalendar-errata\|iCalendar errata]]
	* [[icalendar-implementations\|iCalendar implementations]]		* [[icalendar-implementations\|iCalendar implementations]]
			* [[icalendar-issues\|iCalendar issues]]
	* [[hcalendar\|hCalendar]]		* [[hcalendar\|hCalendar]]