Template:Birth-date and age/doc

This is a documentation subpage for Template:Birth-date and age.
It may contain usage information, categories and other content that is not part of the original template page.

This template is used on approximately 14,000 pages and changes may be widely noticed. Test changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Consider discussing changes on the talk page before implementing them.

This template uses Lua:

Module:Check for unknown parameters (sandbox)

{{Birth-date and age}} displays a person's birth date and age. Besides calculating the age of the person, the benefit of using this template is to allow for the inclusion of hidden microformat dates, which may be indexed or searched by software tools.

Note: The template may not calculate the age correctly if a full date (month, day, year) is not provided. For example, a person who was born in 1941 could be either 82 or 83, depending on whether they have reached their birthday in the current year:

{{Birth-date and age|1941}} → 1941 (age 83)

{{Birth-date and age|November 1941}} → November 1941 (age 83)

When only the year is known, consider using {{Birth year and age}} instead:

{{Birth year and age|1941}} → 1941 (age 82–83)

{{Birth year and age|1941|11}} → November 1941 (age 82–83)

Usage

Format: {{Birth-date and age| birth date }}; {{Birth-date and age| birth date | wikitext to display in place of 'birth date'. Like the right hand parameter in a wikilink, this could be alternate text, links, templates etc. }}

hCard microformat

This template also returns the date, hidden by CSS, in the ISO 8601 standard.^[1] ^[2] For example:

(<span class="bday">1993-02-24</span>)

Note: For the "foundation", "built" and similar set-up dates of companies, buildings etc., use {{start date}} (this will work for year-only or month-year dates). Because the ISO 8601 standard requires the Gregorian calendar, this template should not be used if the date is given in the Julian calendar.

For further information, visit the microformats project.

Examples

**Examples of {{Birth-date and age}}** *(colors for emphasis only)*
Month first format: Sample below displays April 12, 1941 (1941-04-12) (age 83), with invisible microformat date: 1941-04-12 `{{Birth-date and age\|April 12, 1941}}`
Day first format: Sample below displays 12 April 1941 (1941-04-12) (age 83), with invisible microformat date: 1941-04-12 `{{Birth-date and age\|12 April 1941}}`
Year only, year and month only: Sample below displays 1941 (1941) (age 83), with invisible microformat date: 1941 `{{Birth-date and age\|1941}}`
Demo of ISO date, as well as alternate displays. Sample below displays Twelfth of April, 1941 (1941-04-12) (age 83), with invisible microformat date: 1941-04-12 `{{Birth-date and age\|1941-04-12\|Twelfth of April, 1941}}`

Microformat output

Birth date and age templates:

{{Birth-date and age|31 December 2016}} → 31 December 2016 (age 7)

31 December 2016<span style="display:none">&#160;(<span class="dtstart bday">2016-12-31</span>)</span> (age&nbsp;<span class="currentage"></span>7)

{{Birth date and age|2016|12|31|df=y}} → 31 December 2016 (age 7)

<span style="display:none"> (<span class="bday">2016-12-31</span>) </span>31 December 2016<span class="noprint ForceAgeToShow"> (age&nbsp;7)</span>

Parameters

{{birth-date and age|birth date|additional parameters}}

Parameter			Default
(required)	1	Birth date. May be year only, year and month, year month and day, expressed in natural formats: e.g.: 24 August 1953, 1955-08-25, Sunday, December 7, 1941. If parameter three is not specified, the birth date is displayed in exactly this format. This value as well as parameter 2 may not include links. If links or templates that do not evaluate as recognizable dates are desired, use parameter 2.	–
(optional)	2	The birth date to display. This may include links or templates, or any combination of them, and overrides parameter 1.	parm 1
(optional)	bce	If birth date is BC, set to "b".	–
(optional)	gregorian	If Julian date is used, this parameter is required. The date provided is used for emitting the correct microformat translation of the birth date.	parm 1
(optional)	dt	This value if present is the ISO8601 value emitted to indicate microformat birth date. It overrides any calculated value.	–

Supporting templates

Alternative template

Template:Birth date and age (The name of the alternative template does not have a hyphen after "Birth".)

Tracking categories

Category:Birth-date and age transclusions with invalid parameters (0)
Category:Date of birth not in Wikidata (17,703) – added by Template:Birth-date
Category:Articles without Wikidata item (54) – added by Template:Birth-date and other templates