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2020-07-18T16:21:41Z

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	~~<entry-title>~~Date Design Pattern~~</entry-title>~~		{{DISPLAYTITLE:Date Design Pattern}}

	This is a page describes a date design pattern.		This is a page describes a date design pattern.

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Changed protection level for "date-design-pattern" [edit=sysop:move=sysop]

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Tantek: entry-title, dates on their own have worked well with no issues long enough to be accepted, pattern stands on its own independent of datetime-design-pattern, year, year-month allowed

2011-10-26T22:16:41Z

entry-title, dates on their own have worked well with no issues long enough to be accepted, pattern stands on its own independent of datetime-design-pattern, year, year-month allowed

← Older revision		Revision as of 22:16, 26 October 2011
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	~~'''This page is a draft.'''~~		<entry-title>Date Design Pattern</entry-title>

	~~= Date Design Pattern =~~		This is a page describes a date design pattern.

	This is a page ~~for exploring~~ a date design pattern~~. This pattern is a subset of the [[datetime-design-pattern]]~~.

	== Purpose ==		== Purpose ==
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	== Practical Need ==		== Practical Need ==

	The [[datetime-design-pattern]] arose as a result of solving the practical need for human readable dates for [[hcalendar\|hCalendar]]. While concerns have been raised about the readability of complete datetimes, those concerns don't apply for ~~date stamps~~ that do not include time or timezone information.		The [[datetime-design-pattern]] arose as a result of solving the practical need for human readable dates for [[hcalendar\|hCalendar]]. While concerns have been raised about the readability of complete datetimes, those concerns don't apply for dates that do not include time or timezone information.

	The date design pattern provides an internationalized way of representing dates. For example, the string 02/03/01 could represent February 3rd 2001, March 2nd 2001 or even March 1st 2002 depending on the cultural context. The string 2001-03-02 is ~~less ambiguous~~ and is the best choice for accurate readability for the most people worldwide.		The date design pattern provides an internationalized way of representing dates. For example, the string '''02/03/01''' could represent February 3rd 2001, March 2nd 2001 or even March 1st 2002 depending on the cultural context. The string 2001-03-02 is unambiguous and is the best choice for accurate readability for the most people worldwide.

	== How to use it ==		== How to use it ==

	The full [[~~datetime-design-pattern~~]] ~~has the~~ format:		The full [[ISO8601]] datetime format is as follows:

	:<pre>YYYY-MM-DDTHH:MM:SS+ZZ:ZZ</pre>		:<pre>YYYY-MM-DDTHH:MM:SS+ZZ:ZZ</pre>

	The date design pattern, ~~which is a subset of~~ the ~~datetime design pattern~~, ~~has~~ the format:		The date design pattern, uses only the year, month, and day of the month of that format:

	:<pre>YYYY-MM-DD</pre>		:<pre>YYYY-MM-DD</pre>
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	:<pre><abbr class="foo" title="YYYY-MM-DD">Date</abbr></pre>		:<pre><abbr class="foo" title="YYYY-MM-DD">Date</abbr></pre>

	As with the datetime design pattern, the date design pattern is based on the [[iso-8601\|ISO8601]] standard. ~~This standard~~ allows for dates to be written without dashes (YYYYMMDD). This usage is <strong>strongly discouraged</strong> when publishing microformats as it significantly reduces the readability of the date.		As with the datetime design pattern, the date design pattern is based on the [[iso-8601\|ISO8601]] standard. ISO8601 also allows for dates to be written without dashes (YYYYMMDD). This usage is <strong>strongly discouraged</strong> when publishing microformats as it significantly reduces the readability of the date.

	==Current uses==		==Current uses==

	This pattern can be used in [[hCalendar]] for:		This pattern can be used in [[hCalendar]] for:

	* dtstart		* dtstart
	* dtend		* dtend

	In [[hCard]] the date design pattern can be used for:		In [[hCard]] the date design pattern can be used for:

	* bday		* bday

	This pattern can be used in [[hReview]] for:		This pattern can be used in [[hReview]] for:
			* dtreviewed

	* ~~dtreviewed~~		And in [[hAtom]] for:
			* published
			* updated

	==Accessibility ~~issues~~==		==Accessibility ==
	Concerns ~~have~~ raised about accessibility issues [http://www.webstandards.org/2007/04/27/haccessibility/] with the [[datetime-design-pattern]] when it is used in conjunction with the [[abbr-design-pattern]].		Concerns were raised in the past about <span id="Accessibility_issues">accessibility issues</span> [http://www.webstandards.org/2007/04/27/haccessibility/] with the [[datetime-design-pattern]] when it is used in conjunction with the [[abbr-design-pattern]].

	These concerns are both significantly lessened with the [[date-design-pattern]] as only dates, rather than full datetimes, and in fact improved, as the ISO8601 YYYY-MM-DD format for dates is the best choice that is the most accurately readable for the most people worldwide, and thus the most accessible as well.		These concerns are both significantly lessened with the [[date-design-pattern]] as only dates, rather than full datetimes, and in fact improved, as the ISO8601 YYYY-MM-DD format for dates is the best choice that is the most accurately readable (and listenable) for the most people worldwide, and thus the most accessible as well.

	== Specificity ==		== Specificity ==
			ISO 8601 and W3CDTF (but not RFC 3339) allow less specific dates, excluding the day and month. e.g. "2008-09" (September 2008) or "2008" (the year 2008). The [[vCard4]] standard permits year only and year-month syntaxes [http://tools.ietf.org/html/rfc6350#section-4.3], thus so does the date design pattern.
	ISO 8601 and W3CDTF (but not RFC 3339) allow less specific dates, excluding the day and month. e.g. "2008-09" (September 2008) or "2008" (the year 2008). ~~It is unclear whether~~ the date pattern ~~is ''intended'' to allow such dates, but certainly most microformat parsers seem to support them~~.

	== See Also ==		== See Also ==

	* [[Main_Page#Design_Patterns\|All microformat design patterns]]		* [[Main_Page#Design_Patterns\|All microformat design patterns]]
	* ~~The date design pattern is a subset of the~~ [[datetime-design-pattern]]		* [[datetime-design-pattern]]
	* ~~The~~ [[abbr~~-design-pattern]] can be used by [[date~~-design-pattern]]		* [[abbr-design-pattern]]
	* RFC [http://www.faqs.org/rfcs/rfc3339.html 3339]: Date and Time on the Internet: Timestamps		* RFC [http://www.faqs.org/rfcs/rfc3339.html 3339]: Date and Time on the Internet: Timestamps
	* W3C: [http://www.w3.org/QA/Tips/iso-date Use international date format (ISO) - Quality Web Tips]: "Albeit not perfect, ISO date format is, however, the best choice for a date representation that is universally (and accurately) understandable."		* W3C: [http://www.w3.org/QA/Tips/iso-date Use international date format (ISO) - Quality Web Tips]: "Albeit not perfect, ISO date format is, however, the best choice for a date representation that is universally (and accurately) understandable."

date-design-pattern - Revision history

Aaronpk: Replace with {{DISPLAYTITLE:}}

Tantek: Changed protection level for "date-design-pattern" [edit=sysop:move=sysop]

Tantek: Reverted edits by ABIDEEN10 (Talk) to last version by Tantek

ABIDEEN10 at 02:53, 7 April 2013

Tantek: Protected "date-design-pattern" [edit=autoconfirmed:move=sysop]

Tantek: Reverted edits by ABIDEEN1 (Talk) to last version by TomMorris

ABIDEEN1 at 23:35, 3 April 2013

TomMorris: Reverted edits by Feecf (Talk) to last version by Tantek

Feecf at 21:16, 2 April 2013

Tantek: entry-title, dates on their own have worked well with no issues long enough to be accepted, pattern stands on its own independent of datetime-design-pattern, year, year-month allowed