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It is catalogued under the topic Date-computing templates.
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This template converts date elements, or date and time elements, into a Julian date timestamp. It interprets all dates starting at 15 October 1582 in the Gregorian calendar, otherwise it uses the Julian calendar that was valid until 4 October 1582.
Excerpted from Wikipedia’s “Template:JD” article, available under the CC BY-SA 4.0 licence.