Template:Birth based on age as of date

Template documentation[view] [edit] [history] [purge]

Do NOT use this template when the person is dead; consider {{Birth based on age at death}} instead.

This template employs intricate features of template syntax. You are encouraged to familiarise yourself with its setup and parser functions before editing the template. If your edit causes unexpected problems, please undo it quickly, as this template may appear on a large number of pages. You can conduct experiments, and should test all major changes, in either this template's sandbox, the general template sandbox, or your user space before changing anything here.

This template calculates a person's birth year and current age based on their previous age at a certain date. This is useful when a reliable source states only their age at the time of publication.

Syntax

 {{birth based on age as of date |age|year|month|day}} 

The age, year, and day must be supplied as natural numbers; month can be specified as a natural number as well as by name or abbreviation (e.g. "August" or "Aug"). The Gregorian calendar is assumed, with no special support provided for dual dating or the difference between Old Style and New Style dates.

If they are not known, the "day" and "month" fields can be omitted; this is useful if, for example, only the publication year for a source is known.

Options

To suppress the age field:

 {{birth based on age as of date |age|year|month|day|noage=1}} 

With the "noage=1" option, the month and day can be "1".

To replace the '/' separator with ' or ' in compliance with WP:APPROXDATE, add |mos=1

{{birth based on age as of date |50|2024|04|28|mos=1}}

1973 or 1974 (age 51)

Examples

If, for example, a reference dated July 4, 2024 mentions that someone is 50 years old, that person's birth year and age can be rendered using:

{{birth based on age as of date |50|2024|July|4}}

The following examples are for a person reported as being 50 years old in 2024

Template code Result {{birth based on age as of date | 50 | 2024 | 04 | 28}} 1973/1974 (age 51) {{birth based on age as of date | 50 | 2024 | April | 28}} 1973/1974 (age 51) {{birth based on age as of date | 50 | 2024 | 12 | 31}} 1973/1974 (age 50–51) {{birth based on age as of date | 50 | 2024 | Jan | 1}} 1973/1974 (age 51–52) {{birth based on age as of date | 50 | 2024 | 12 | 31 | noage=1}} 1973/1974 {{birth based on age as of date | 50 | 2024 | Jan | 1 | noage=1}} 1973/1974 {{birth based on age as of date | 50 | 2024 | April}} 1973/1974 (age 50–52) {{birth based on age as of date | 50 | 2024 | Jan}} 1973/1974 (age 51–52) {{birth based on age as of date | 50 | 2024 | 12}} 1973/1974 (age 50–51) {{birth based on age as of date | 50 | 2024}} 1973/1974 (age 50–52)

Template parameters

This template prefers inline formatting of parameters.

Parameter		Description	Type	Status
Age	1	Age of subject at date of reference's publication. Example 55	Number	required
Year	2	Year of publication of reference. Example 1950	Number	required
Month	3	Month of publication of reference. Example 8 or August	String	suggested
Day	4	Day of publication of reference. Example 21	Number	suggested
MOS compliance	mos	Set to a value of 1 to replace the '/' separator with ' or ' in compliance with [[WP:APPROXDATE]]. Example 1	Number	optional
Hide age	noage	Set to a value of 1 to display year of birth without the age. Example 1	Number	optional

This template calculates the birth year and current age based on the age as of a date.

Redirects

• Template:Bbad
• Template:Birth year from age as of date
• Template:Birth year from age at date

The documentation on top is transcluded from Template:Birth based on age as of date/doc. (edit | history)
Editors can experiment in this template's sandbox (create | mirror) and testcases (create) pages.
Add categories to the /doc subpage. Subpages of this template.