Wikipedia:Manual of Style/Dates and numbers/Date autoformatting: Difference between revisions

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{{SupplementSuperseded|[[Wikipedia:Manual of Style (dates/Dates and numbers)]]#Dates, months and years}}

{{Rejected|date=September 2008<!--Consensus actually rejected this in two 2008 RfCs, reaffirmed in a followup in 2009, but the feature wasn't disabled until February 2013.-->|comment=<br/>'''The data autoformatting feature is [[mw:Manual:$wgUseDynamicDates|no longer part of the MediaWiki software]]'''}}

AsSince ofat Septemberleast 20082004, it has been possible for registered users to chooseset onea of four preferencespreference regarding howthe way dates areappear to bethem. presentedWikilinking toall them.{{nowrap|dates&thinsp;/&thinsp;years}} Thepurely fourfor choicesthe areuse of autoformatting is now discouraged (See [[MOS:UNLINKDATES]]).

There are four possible formats to choose from:

* '''MonthName Day, Year''' as in January 15, 2001 (symbolized as MMMM dD, YYYY)

* '''Day MonthName Year''' as in 15 January 2001 (symbolized as dD MMMM YYYY)

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* '''Year-MonthNumber-Day''' as in 2001-01-15 (symbolized as YYYY-MM-DD) Though not identified as such on the preferences page, this is the same way dates are displayed in [[ISO 8601]] format.

Dates that wereare wikilinked (see below) would then beare autoformatted according to the preferenceuser's thatchosen had been chosenpreference.

Autoformatting dates has had several disadvantages:

* Its effects can only be seen by registered editors, who areselect a small minority of Wikipedia's readership, and even then only if they change their date preferencespreference ('''My preferences&nbsp;→ Date and time&nbsp;→ Date format'''). from(As thewith defaultother "Nointerface preference".modifications, Unregisteredunregistered users cannotare chooseunable ato dateaccess formatWikipedia's preference; itsettings hasand beencannot editorschoose whoa weredate mostformat likely to set this preferencespreference.) Therefore, most of the very individuals who have been largely responsible for the correctness and good style of articles have not seen what the vast majority of readers see.

** As a result, editors did not notice that the source code often had two (or possibly more) date formats in the same article, while most users saw inconsistent date formats on the same page.

** Some dates were entered in source code in one or more of the last two formats. While most editors did not notice this, most users saw a format that was much less familiar to them than either MDY or DMY.

* Autoformatting wasis implemented by wikilinking dates. The resulting links point to articles on notable events that happened on that particular date or year. Since these lists of historical trivia typically have little or nothing to do with the subject of the article linked from, the links are superfluous, and only serve to clutter articles unnecessarily. All links from articles should be of ''high value to the reader'', that is, following them should genuinely help the reader understand the topic more fully. (See [[WP:CONTEXT]].)

* The last format, being most like ISO 8601, was sometimes referred to as ''being'' ISO format. However, ISO 8601 format implies use of the [[Gregorian calendar]], and Wikipedia normally uses the [[Julian calendar]] for historic dates before the adoption of the Gregorian calendar—all dates before 1582, many before 1752, and some as late as the twentieth century. <!--Dates before 1583 should not be wikilinked, lest they be autoformatted.|This is advice, not a statement of disadvantages--> Autoformatting into and out of this format could be misleading or erroneous for dates on the Julian Calendar, if one thought this format was truly ISO 8601.

The following information is provided to document how date autoformatting works.

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'''A combination of a day and a month, plus optionally a year, is autoformatted by adding square brackets,''' such as in these examples:

*<nowiki>[[5 November]]</nowiki>

*<nowiki>[[November 5]]</nowiki>

*<nowiki>[[5 November]] [[1989]]</nowiki>

*<nowiki>[[November 5]], [[1989]]</nowiki>

The square brackets instruct the MediaWiki software to format the item according to thea user's [[m:Help:Date formatting and linking|date preferences]] for registered users who have chosen a setting and are logged in.

The following table shows how the autoformatting mechanism behaves. The preference settings that a logged-in, registered user can choose are displayed in the second row. The year and the day-month combination are wikilinked separately, except for dates in the [[ISO 8601]] format. Full date formats not found in the first column are not autoformatted when wikilinked, and are likely to produce a redlink; for instance, "<code>
*<nowiki>[[2005 May 15]]</nowiki></code>" produces''will present''' "[[2005 May 15]]'''.", and

*<nowiki>[[April 17, 1883]]</nowiki> ''will present'' "[[April 17, 1883]]"

to all users, regardless of their date preference (or non-preference).

*However <nowiki>[[May 15, 2005]]</nowiki>, ''but no other format'', will produce a wikilink to a separate page for [[May 15, 2005]]. This is true for all dates from [[January 1, 2003]] (retrieved by typing <nowiki>[[January 1, 2003]]</nowiki>) to [[July 31, 2005]].

<center>

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| rowspan="2" | '''What you type'''

| colspan="5" | '''What logged-in registered users see<br>(settings on first row)'''

| rowspan="2" | '''What others will see'''&thinsp;^{<span id="ref_A" />[[#endnote_A|'''[A]''']]}

|-

| January 15, 2001

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|-

| <nowiki>[[May 15]]</nowiki>

| [[May 15|May 15]]

| [[May 15|15 May]]

| [[May 15]]
| [[May 15]]

| [[May 15]]
| [[May 15]]

| [[May 15|May 15]]

| [[May 15|May 15]]

|-

| <nowiki>[[15 May]]</nowiki>

| [[May 15|May 15]]

| [[May 15|15 May]]

| [[May 15|15 May]]

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|-

| <nowiki>[[May 15]], [[2005]]</nowiki>

| [[May 15|May 15]], [[2005]]

| [[May 15|15 May]] [[2005]]

| [[2005]] [[May 15|May 15]]

| [[2005]]-[[May 15|05-15]]

| [[May 15|May 15]], [[2005]]

| [[May 15|May 15]], [[2005]]

|-

| <nowiki>[[15 May]] [[2005]]</nowiki>

| [[May 15|May 15]], [[2005]]

| [[May 15|15 May]] [[2005]]

| [[2005]] [[May 15|May 15]]

| [[2005]]-[[May 15|05-15]]

| [[May 15|15 May]] [[2005]]

| [[May 15|15 May]] [[2005]]

|-

| &nbsp;&nbsp;<nowiki>[[2005-05-15]]</nowiki>&thinsp;^{<span id="ref_B" />[[#endnote_B|'''[B]''']]}

| [[May 15|May 15]], [[2005]]

| [[May 15|15 May]] [[2005]]

| [[2005]] [[May 15|May 15]]

| [[2005]]-[[May 15|05-15]]

| [[2005]]-[[May 15|05-15]]

| [[2005]]-[[May 15|05-15]]

|-

| align="left" colspan="8" | <div class="references-small"><ol class="references" style="list-style-type:upper-alpha"><li id="endnote_A">[[#ref_A|'''^''']] Non-registered users and registered users not logged in</li><li id="endnote_B">[[#ref_B|'''^''']] Editors are discouraged from using this format since non-registered users, who constitute the majority of readers, may see a hard-to-read date format.</li></ol></div>

|}

</center>

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Even when surrounded by square brackets, those dates that do not contain both a day and a month—such as solitary months, solitary days of the week, solitary years, decades, centuries, and month-year combinations—are not autoformatted. One could make them links by using the standard piped-link notation, but the same advice applies here: such links should not be created unless they are of high value to the reader. (See [[WP:CONTEXT]].)

*Autoformatting Pipeddoes not function for piped links to date elements, such as "<code><nowiki>[[20 June|the 20th of June]]</nowiki></code>" or "<code><nowiki>[[1997 in South African sport|1997]]</nowiki></code>". (Several forms of piped links breakoverride the date-formatting function.)

Autoformatting fails to work in the following situations:

* Links to date ranges in the same calendar month, such as "<code><nowiki>[[December 13-1713–17]]</nowiki></code>" or "<code><nowiki>the night of [[30/31 May]]</nowiki></code>" cause autoformatting to fail. The autoformatting mechanism will output such dates in a damaged form: '''30/May 31''', etc.

* Piped links to date elements, such as "<code><nowiki>[[20 June|the 20th of June]]</nowiki></code>" or "<code><nowiki>[[1997 in South African sport|1997]]</nowiki></code>". (Several forms of piped links break the date-formatting function.)

* Links to date ranges in the same calendar month, such as "<code><nowiki>[[December 13-17]]</nowiki></code>" or "<code><nowiki>the night of [[30/31 May]]</nowiki></code>". The autoformatting mechanism will output such dates in a damaged form: '''30/May 31''', etc.

Date elements on disambiguation pages and section headings should never be linked; the same applies to quotations, unless the original quote is linked.

[[Category:Wikipedia how-tofailed proposals|Date Autoformatting]]