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It is catalogued under the topic Date-computing templates.
Its subject is documented across 33 Wikipedia language editions.
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This template computes the number of the Julian day starting at noon on the date given in parameter (in the Julian calendar, including after the dates of transition to the Gregorian calendar).
Excerpted from Wikipedia’s “Template:JULIANDAY.JULIAN” article, available under the CC BY-SA 4.0 licence.