Editing Template:Birth based on age as of date/doc (section)

== Syntax ==
=== Typical use ===
<syntaxhighlight lang="wikitext"> {{birth based on age as of date | age | year | month | day }} </syntaxhighlight>
<div style="margin-left:1.6em;">Code:</div>
<div style="margin-left:3.2em;"><code><nowiki>{{birth based on age as of date|50|</nowiki>{{#expr:{{CURRENTYEAR}}-2}}|{{#expr:12-{{CURRENTMONTH}}+1}}|{{CURRENTDAY}}<nowiki>}}</nowiki></code></div>
<div style="margin-left:1.6em;">Result:</div>
<div style="margin-left:3.2em;">{{birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-2}}|{{#expr:12-{{CURRENTMONTH}}+1}}|{{CURRENTDAY}}}}
</div>
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 only the publication year for a source is known, the "day" and "month" fields can be omitted.

=== No age ===
In some contexts—like the lead sentence of a biography—it may be desirable to show only the birth year, and not a person’s age. To suppress the age field, set {{para|noage|yes}}:
<div style="margin-left:1.6em;">Code:</div>
<div style="margin-left:3.2em;"><code><nowiki>{{birth based on age as of date|50|</nowiki>{{#expr:{{CURRENTYEAR}}-2}}|{{#expr:12-{{CURRENTMONTH}}+1}}|{{CURRENTDAY}}|noage=1|slash=y<nowiki>}}</nowiki></code></div>
<div style="margin-left:1.6em;">Result:</div>
<div style="margin-left:3.2em;">{{birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-2}}|{{#expr:12-{{CURRENTMONTH}}+1}}|{{CURRENTDAY}}|noage=1|slash=yes}}</div>

=== Separator ===
In general, the two possible birth years should be written out as: {{xt|1950 or 1951}}. In contexts which are tight for space, the separator between the two possible years should be a slash: {{xt|1950/1951}}. 

To use the <code>/</code> separator, add {{para|slash|yes}}.
<div style="margin-left:1.6em;">Code:</div>
<div style="margin-left:3.2em;"><code><nowiki>{{birth based on age as of date|50|</nowiki>{{#expr:{{CURRENTYEAR}}-2}}|{{#expr:12-{{CURRENTMONTH}}+1}}|{{CURRENTDAY}}|slash=yes<nowiki>}}</nowiki></code></div>
<div style="margin-left:1.6em;">Result:</div>
<div style="margin-left:3.2em;">{{birth based on age as of date|50|{{#expr:{{CURRENTYEAR}}-2}}|{{#expr:12-{{CURRENTMONTH}}+1}}|{{CURRENTDAY}}|slash=yes}}</div>