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Logtalk - Object oriented extension to Prolog
Release 2.21.0

Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
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% start by loading the example:

| ?- logtalk_load(loader).
...


% some queries using the time and date parametric objects:

| ?- date(Year, Month, Day)::today.

Year = 2000
Month = 8
Day = 15 

Yes


| ?- date(Year, _, _)::(today, \+ leap_year). 

Year = 2002

yes


| ?- time(Hours, Mins, Secs)::now.

Hours = 13
Mins = 52
Secs = 42 

Yes