View source for Template:Birth based on age as of date/doc

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

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 [[wp:reliable source|reliable source]] states only their age at the time of publication.

===Syntax===
<pre> {{birth based on age as of date |age |year|month|day}} </pre>
The age, year, and day must be supplied as [[natural number]]s; 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:
<pre> {{birth based on age as of date |age |year|month|day |noage=1}} </pre>

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

To replace the '/' separator with ' or ' in compliance with [[WP:APPROXDATE]], add {{para|mos|1}}
:<code><nowiki>{{birth based on age as of date|50 |</nowiki>{{#expr:{{CURRENTYEAR}}-1}}|{{CURRENTMONTH}}|{{CURRENTDAY}}|mos=1}}</code>
::{{birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|{{CURRENTMONTH}}|{{CURRENTDAY}}|mos=1}}

===Examples===
If, for example, a reference dated July 4, {{#expr:{{CURRENTYEAR}}-1}} mentions that someone is 50 years old, that person's birth year and age can be rendered using:
 <nowiki>{{birth based on age as of date |50 |</nowiki>{{#expr:{{CURRENTYEAR}}-1}}|July|4}}

{| class="plainlinksneverexpand" style="margin-top:0;"
!style="border:1px solid #aaa;background:#dfd;"|
The following examples are for a person reported as being 50 years old in {{#expr:{{CURRENTYEAR}}-1}}
|-
|
{{Aligned table
   |class=wikitable |colstyle=padding-right:1.0em;
   |col1style=font-family:monospace;padding-right:1.0em;
   |row1header=on| {{sans-serif|Template code}} | Result

   | {{braces|birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|{{CURRENTMONTH}}|{{CURRENTDAY}}}}
   |        {{birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|{{CURRENTMONTH}}|{{CURRENTDAY}}}}

   | {{braces|birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|{{CURRENTMONTHNAME}}|{{CURRENTDAY}}}}
   |        {{birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|{{CURRENTMONTHNAME}}|{{CURRENTDAY}}}}

   | {{braces|birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|12|31}}
   |        {{birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|12|31}}

   | {{braces|birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|Jan|1}}
   |        {{birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|Jan|1}}

   | {{braces|birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|12|31|noage{{=}}1}}
   |        {{birth based on age as of date|50 |{{#expr:{{CURRENTYEAR}}-1}}|12|31|noage=1}}

   | {{braces|birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-1}}|Jan|1|noage{{=}}1}}
   |        {{birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-1}}|Jan|1|noage=1}}

   | {{braces|birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-1}}|{{CURRENTMONTHNAME}}}}
   |        {{birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-1}}|{{CURRENTMONTHNAME}}}}

   | {{braces|birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-1}}|Jan}}
   |        {{birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-1}}|Jan}}

   | {{braces|birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-1}}|12}}
   |        {{birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-1}}|12}}

   | {{braces|birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-1}}}}
   |        {{birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-1}}}}
  }}
|}

{{Birth, death and age templates |BDA}}

<includeonly>{{Sandbox other|
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[[Category:Date mathematics templates]] 
}}</includeonly>
<templatedata>
{
	"params": {
		"1": {
			"label": "Age",
			"description": "Age of subject at date of reference's publication.",
			"example": "55",
			"type": "number",
			"required": true
		},
		"2": {
			"label": "Year",
			"description": "Year of publication of reference.",
			"example": "1950",
			"type": "number",
			"required": true
		},
		"3": {
			"label": "Month",
			"description": "Month of publication of reference.",
			"example": "8 or August",
			"type": "string",
			"suggested": true
		},
		"4": {
			"label": "Day",
			"description": "Day of publication of reference.",
			"example": "21",
			"type": "number",
			"suggested": true
		},
		"mos": {
			"label": "MOS compliance",
			"description": "Set to a value of 1 to replace the '/' separator with ' or ' in compliance with [[WP:APPROXDATE]].",
			"example": "1",
			"type": "number"
		},
		"noage": {
			"label": "Hide age",
			"description": "Set to a value of 1 to display year of birth without the age.",
			"example": "1",
			"type": "number"
		}
	},
	"description": "This template calculates the birth year and current age based on the age as of a date.",
	"format": "inline"
}
</templatedata>

==Redirects==
* [[Template:Bbad]]
* [[Template:Birth year from age as of date]]
* [[Template:Birth year from age at date]]