Editing Help:Citation Style 1 (section)

===Dates===
Dates are indicated by these parameters:
* '''date''': Date of publication edition being referenced, in the same format as other dates in citations in the same article. Must not be wikilinked.
** or: '''year''': Year of publication edition being referenced.  Do not use in combination with '''date''', except in the rare case that {{em|both}} of the following conditions are met:
**#the publication-date format in the template is YYYY-MM-DD
**#the citation requires a <code>[[Wikipedia:Citation templates and reference anchors|CITEREF]]</code> [[Template:Sfn#More than one work in a year|disambiguator]]
* '''orig-date''': Original publication date or year, for display (in square brackets) after the '''date''' (or '''year'''). For clarity, please supply specifics, for instance <code>|orig-date=first published 1859</code> or <code>|orig-date=composed 1904</code>. This parameter displays only if there is a value for '''date''' (or '''year'''). Alias: '''origyear'''.
When a source does not have a publication date, use {{para|date|n.d.}} or {{para|date|nd}}

Acceptable date formats are shown in the "Acceptable date formats" table of the {{section link|Manual of Style/Dates and numbers|Dates, months and years}}. Further points:
* Prescriptions about date formats apply only when the date is expressed in terms of Julian or Gregorian dates, or when the date contains one of the seasons (spring, summer, autumn or fall, winter). Sources are at liberty to use other ways of expressing dates, such as "spring/summer" or a date in a religious calendar; editors should report the date as expressed by the source. [[WP:SEASON|Although the seasons are not normally capitalized]], they are capitalized when used as dates in CS1 templates, and the capitalization of the season stated by the source may be altered to follow this convention. In cases where the date as expressed in the source is not compatible with the template software, the citation should be created without using a template.
* Do not wikilink.
* Access and archive dates in references should be in either the format used for [[MOS:DATEUNIFY|publication dates]], or YYYY-MM-DD.

====Date format compliance with Wikipedia's Manual of Style====
CS1 uses {{section link|Wikipedia:Manual of Style/Dates and numbers|Dates, months, and years}} ([[MOS:DATEFORMAT]]) as the reference for all date format checking performed by [[Module:Citation/CS1]].  For various reasons, CS1 is not fully compliant with MOS:DATEFORMAT. This table indicates CS1 compliance with the listed sections of MOS:DATEFORMAT.
{|class="wikitable plainrowheaders" style="margin: 1em auto 1em auto;"
|+CS1 compliance with [[Wikipedia:Manual of Style/Dates and numbers]]
!scope="col"| Section
!scope="col"| Compliant
!scope="col"| Comment
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Acceptable date formats|Acceptable date formats table]]
| yes
| Exceptions: linked dates not supported;<br />sortable dates not supported ({{tlx|dts}} etc.);<br />proper name dates not supported with the exception of 'Easter YYYY' and 'Christmas YYYY';<br />shortened month names longer than three characters or with terminating periods not supported;<br />quarterly dates supported in the form 'First Quarter 2020'
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Unacceptable date formats|Unacceptable date formats table]]
| yes
|
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Consistency|Consistency]]
| yes<sup>{{dagger}}</sup>
|rowspan="3"| Article-level restrictions are beyond the scope of CS1<br /><sup>{{dagger}}</sup>CS1/CS2 templates follow the format specified by the article's {{tlx|use dmy dates}} or {{tlx|use mdy dates}} templates; see [[#Auto-formatting citation template dates|Auto-formatting citation template dates]]
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Strong national ties to a topic|Strong national ties to a topic]]
| no
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Retaining existing format|Retaining existing format]]
| no
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Era style|Era style]]
| no
|Dates earlier than 100 not supported. Wikipedia [[Wikipedia:Citing sources#Say where you read it|editors seldom read ancient manuscripts directly]]; the specific, modern, published edition read by the editor is what goes in the source citation. Thus, the date of the source actually consulted should be provided in {{para|date}}, and the date of the ancient source may be provided in {{para|orig-date}}; the format of the orig-date value is not checked for errors.
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Julian and Gregorian calendars|Julian and Gregorian calendars]]
| limited
| Julian prior to 1582; Gregorian from 1582; assumes Gregorian in the overlap period of 1582 – c. 1923
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Ranges|Ranges]]
| yes
| Exceptions: does not support the use of <code>&amp;ndash;</code> or <code>&amp;nbsp;</code><br />does not support dates prior to 100;<br />does not support solidus separator (/)<br />does not support " to " as a date separator<br />does not support YYYY–YY where the two-digit year is less than 13 (change to YYYY–YYYY to eliminate the error message)
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Uncertain, incomplete, or approximate dates|Uncertain, incomplete, or approximate dates]]
| yes
| Exceptions: does not support {{tlx|circa}} or {{tlx|floruit}};<br />does not support dates prior to 100;<br />Supports <code>c. </code> only with a single year value (no ranges or day/month combinations).
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Days of the week|Days of the week]]
| no
|
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Seasons|Seasons]]
| limited
| CS1 capitalizes seasons used as dates in citations, in line with external style guides
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Decades|Decades]]
| no
|
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Centuries and millennia|Centuries and millennia]]
| no
|
|-
!scope="row"| [[Wikipedia:Manual of Style/Dates and numbers#Abbreviations for long periods of time|Abbreviations for long periods of time]]
| no
|
|}

====Date range, multiple sources in same year====
If dates are used, the year range is 100 to present without era indication (AD, BC, CE, BCE). In the case where the same author has written more than one work in the same year, a lower-case letter may be appended to the year in the date parameter ({{xt|{{!}}date&#61;July 4, 1997b}}) or the year parameter ({{xt|{{!}}year&#61;1997b}}).

====Auto-formatting citation template dates====
{{Use dmy dates|date={{CURRENTMONTHNAME}} {{CURRENTYEAR}}|cs1-dates=y}}
[[Help:Citation Style 1|Citation Style 1]] and [[Help:Citation Style 2|2]] templates automatically render dates ({{para|date}}, {{para|access-date}}, {{para|archive-date}}, etc.) in the style specified by the article's {{tlx|use dmy dates}} or {{tlx|use mdy dates}} template. Editors may also choose how CS1/CS2 templates render dates by the use of {{para|cs1-dates|&lt;{{var|keyword}}>}} in the article's {{tld|use xxx dates}} template.<section begin="auto_date_format_table" />
{| class="wikitable"
|+Acceptable <code>{{pipe}}cs1-dates=</code> keywords
!scope="col"| Keyword
!scope="col"| Definition
|-
!scope="row"| <code>l</code>
|rowspan="2"| long-form publication and access- / archive-dates;<br />this is the default case when {{para|cs1-dates|plain=yes}} is omitted or empty
|-
!scope="row"| <code>ll</code>
|-
!scope="row"| <code>ls</code>
| long-form publication dates; abbreviated access- / archive-dates
|-
!scope="row"| <code>ly</code>
| long-form publication dates; year-initial numeric access- / archive-dates (ymd)
|-
!scope="row"| <code>s</code>
|rowspan="2"| abbreviated publication and access- / archive-dates
|-
!scope="row"| <code>ss</code>
|-
!scope="row"| <code>sy</code>
| abbreviated publication dates; year-initial numeric access- / archive-dates (ymd)
|-
!scope="row"| <code>y</code>
|rowspan="2"| year-initial numeric publication, access- and archive-dates (ymd);<br />cs1|2 cannot reformat Month YYYY, Season YYYY, date-ranges of any form, or [[Julian calendar]] dates into ymd format
|-
!scope="row"| <code>yy</code>
|}<section end="auto_date_format_table" />
Example: to have the CS1/CS2 templates in an article render their publication dates in the long form (fully spelled-out month names) with access-/archive-dates rendered in short form (abbreviated month names), write:
:{{tlx|use dmy dates|date{{=}}{{CURRENTMONTHNAME}} {{CURRENTYEAR}}|cs1-dates{{=}}ls}}

This documentation page has <code><nowiki>{</nowiki>{use dmy dates|date={{CURRENTMONTHNAME}} {{CURRENTYEAR}}|cs1-dates=y}}</code> at the top of this section so this cs1 template will render with ymd dates:
:<code><nowiki>{{</nowiki>cite web |title=Example Webpage |date=31 October 2017 |website=Example |url=https://example.com/ |access-date=Dec 5, 2017}}</code>
::{{cite web |title=Example Webpage |date=31 October 2017 |website=Example |url=https://example.com/ |access-date=Dec 5, 2017}}

This global setting may be overridden in individual CS1/CS2 templates by use of {{para|df}}; abbreviated date forms are not supported by {{para|df}}.

{{lang|la|Nota bene}}: CS1/CS2 auto-date formatting does not apply when previewing an article section that does not contain a {{tld|use xxx dates}} template.