How to compute weekday?

Anthony Mak <[email protected]>
Newsgroups gmane.comp.gnu.prolog.general
Organization National ICT Australia (Canberra office)
Message-ID <[email protected]> 
How can I compute weekday (Monday,Tuesday,....) from a date, say a 
gprolog DateTime structure dt(Year,Month,Day,Hour,Minute,Second)?

Does gprolog has any predicate or function to do this or do I have to 
write my own to do this?

Thanks everybody.

Anthony Mak
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