Template:Citation Style documentation/date

• date: The date of the referenced source, displayed after the authors enclosed in parentheses; can be a full date (month, day and year) or partial (month and year, season and year, or year). Use same format as other publication dates in the citations and do not wikilink. If there is no author, then displays after the website and publisher. For acceptable date formats, see Help:Citation Style 1 § Dates.

Shortened footnotes target full citations using the year specified in this parameter. A lowercase letter may be suffixed to the year to disambiguate {{Sfn}} links to multiple works by the same author in the same year^[more], unless the date is formatted as YYYY-MM-DD. In the latter case, year or ref is required to disambiguate the link targets.

For no date, or "undated", use |date=n.d., and for approximate years precede with "c. ", as in |date=c. 1900.

The date of a web page, PDF, etc. with no visible date can sometimes be established by searching the page source or document code for a created or updated date; a comment for editors such as |date=2021-12-25<!-- Date from page source. -->|orig-date=Original date 2011-01-01 can be added.

• year: The year of publication, however the more flexible date parameter detailed above also handles a year by itself. Do not use in combination with the |date= parameter, unless both of the following conditions are met:
  1. Shortened footnotes target multiple citations with same last name and year of publication. This situation warrants a citation reference anchor disambiguator, usually a lowercase letter suffixed to the year.)
  2. The |date= value is formatted as YYYY-MM-DD, which prevents the addition of a disambiguating letter to the year.
• orig-date: The original publication date or year, displayed in square brackets after the date or year; for clarity, please supply specifics. For example: |orig-date=First published 1859 or |orig-date=Composed 1904. As |orig-date= does not support automatic date formatting, use the same date format as defined by df (or, if it exists, by |cs1-dates=) or as used in the |date= parameter. Alias: orig-year.
• df: The date format for rendered dates; does not support date ranges or seasonal dates and overrides the automatic date formatting described above. Accepts one keyword value which may be one of:
  • mdy – Set publication dates to month day, year format; access- and archive-dates are not modified
  • dmy – As above for day month year format
  • ymd – As above for year-first numeric format YYYY-MM-DD
  • mdy-all – Set publication, access- and archive-dates to month day, year format
  • dmy-all – As above for day month year format
  • ymd-all – As above for year-first numeric format YYYY-MM-DD