In the Vinony graph
It is catalogued under the topic Historical period subtemplates.
Its subject is documented across 48 Wikipedia language editions.
~1 min read
Encyclopedic overview
Template documentation
Converts a year/decade/century/millennium number (prefix a minus for BC) into a representative year (the second year, for decades/centuries/millennia) of that period, for use in {{dr}}. Second parameter is y/d/c/m.
Excerpted from Wikipedia’s “Template:Dr-yr” article, available under the CC BY-SA 4.0 licence.