Prolog help please

timer Asked: Dec 28th, 2013

Question Description

Hello all, I just need some help on this question:
"Write a PROLOG rule that given two people (P1 and P2) and a date D returns the list of all dates of when P1 and P2 have exchanged messages until date D."
After trying this question for 2 days I have had no luck. This is what i have so far:

Database of facts:

Below rule so far:

messcrosscheck1(Sent, Received) :- message(Sent, Received, _); message(Received, Sent, _).
listmessexchange(Sent, Received, Userdate) :- messcrosscheck1(Sent, Received),
       parse_time(Userdate, iso_8601, Userdatenum),
       parse_time(Actualmess, iso_8601, Actualmessnum),
       findall(Actualmess,message(_,_,Actualmess),Length),length(Length,_)       ,write(Length).

Would appreciate help very much thanks.

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