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Pack julian -- prolog/julian/util.pl
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 dow_number(+DayOfWeek:atom, -Number:integer) is semidet
dow_number(-DayOfWeek:atom, +Number:integer) is semidet
dow_number(-DayOfWeek:atom, -Number:integer) is multi
True if Number is the ISO number for DayOfWeek. 0 is Monday, 6 is Sunday. DayOfWeek is an atom like monday, tuesday, sunday, etc.

This predicate supports library(delay).