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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 ISO week date day number (from 1 on Monday to 7 on Sunday) for the date of the Gregorian calendar (or proleptic) in parameter.
Excerpted from Wikipedia’s “Template:Weekday” article, available under the CC BY-SA 4.0 licence.