Template:MJD2DOW
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3
Compare "{{CURRENTDOW|=}}"
gives "Template:CURRENTDOW" [1]. This template returns 1 (Monday) up to 7 (Sunday) for
an ISO 8601 day of the week. CURRENTDOW uses 0 for Sunday,
apart from that the default result of MJD2DOW is identical to the result of CURRENTDOW.
The used formula does not depend on -5 mod 7 being -5 or 2, or -2.5 round 0 being -2 or -3.
{{subst:MJD2DOW|11111|subst=subst:}} gives the wikitext 5.
{{subst:MJD2DOW|subst=subst:}} gave at the time of saving the wikitext 3