Prolog Get the differences in days between two dates -

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i've been trying compare 2 dates in prolog.

the dates format date(yyyy, mm, dd)

ex: (2016,04,21).

i want compare 2 dates , know if difference (in days) between dates bigger 15 days (2 weeks).

%datedifference( number_of_day, date_no1, date_no2 ). datedifference( 35, date(2003,8,16), date(2003,9,20) ).

computing difference in days between 2 dates can simple or tricky depending on calendar , on covered periods. assuming gregorian calendar, common solution convert dates julian days. @mat mentioned in comment, swi-prolog, consider library(julian);

https://github.com/mndrix/julian

for portable solution can used prolog systems (including swi-prolog), logtalk includes third-party iso 8601 library can used these computations:

http://logtalk.org/library/iso8601_0.html


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