Template:Birth based on age as of date/doc

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For a person whose date of birth is unknown, this template estimates the person's birth year and current age based on a given age at a certain date. This is useful when a reliable source states only their age at the time of publication.

Syntax

Typical use:

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

Template:

{{birth based on age as of date|50|2022|2|20}}

Result:

1971/1972 (age 52–53)

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.

Separator

In contexts which are tight for space, the separator between the two possible years should be a slash: 1950/1951. Elsewhere it should be written out, as in: 1950 or 1951.

To use the / separator, add |slash=y (any value will work). To use or, in compliance with WP:APPROXDATE, add |mos=1.

Template:

{{birth based on age as of date|50|2022|2|20|slash=y}}

Result:

1971/1972 (age 52–53)

Template:

{{birth based on age as of date|50|2022|2|20|mos=1}}

Result:

1971 or 1972 (age 52–53)

No age

To suppress the age field, set |noage=1:

Template:

{{birth based on age as of date|50|2022|2|20|noage=1|slash=y}}

Result:

1971/1972

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

Examples

If, for example, a reference dated July 4, 2022 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|2022|July|4}}

The following examples are for a person reported as being 50 years old in 2023

Template code Result {{birth based on age as of date | 50 | 2023 | 11 | 20}} 1972/1973 (age 51) {{birth based on age as of date | 50 | 2023 | Novembala | 20}} 1972/1973 (age –) {{birth based on age as of date | 50 | 2023 | 12 | 31}} 1972/1973 (age 50–51) {{birth based on age as of date | 50 | 2023 | Jan | 1}} 1972/1973 (age 51–52) {{birth based on age as of date | 50 | 2023 | 12 | 31 | noage=1}} 1972/1973 {{birth based on age as of date | 50 | 2023 | Jan | 1 | noage=1}} 1972/1973 {{birth based on age as of date | 50 | 2023 | Novembala}} 1972/1973 (age –) {{birth based on age as of date | 50 | 2023 | Jan}} 1972/1973 (age 51–52) {{birth based on age as of date | 50 | 2023 | 12}} 1972/1973 (age 50–51) {{birth based on age as of date | 50 | 2023}} 1972/1973 (age 50–52)

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

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

Redirects

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