Prolog help please

SoccerBoss
Category:
Programming
Price: $5 USD

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:

message(sonny,robert,'2012-04-12').<br>message(sonny,robert,'2012-03-12').<br>message(shah,asifa,'2012-04-12').<br>message(asifa,nusrat,'2012-03-12').<br>message(shah,nusrat,'2012-05-12').
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),
       message(_,_,Actualmess),
       parse_time(Actualmess, iso_8601, Actualmessnum),
       Userdatenum@>Actualmessnum,
       findall(Actualmess,message(_,_,Actualmess),Length),length(Length,_)       ,write(Length).

Would appreciate help very much thanks.

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