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holidays.pl
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holidays.pl
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/* Part of SWI-Prolog
Author: Anne Ogborn
WWW: http://www.swi-prolog.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(holidays, [
todays_holiday/1
]).
:- dynamic current_holiday/2.
current_holiday(0, none).
/** todays_holiday(-Holiday:atom) is det
*
* succeeds if Holiday is 'todays holiday'
*
* This is none on 'ordinary' days, or
* one of
*
* april_fools_day
* christmas
* koningsdag
* santiklaas
*
* succeeds only within 12 hours either
* side of April 1
*
* April fools day is a traditional holiday celebrated
* by playing hoaxes and practical jokes. A common form
* of this is to substitute nonsensical information where
* useful info is normally displayed.
*
* Koningsdag is 'Kings day' in the Netherlands
* Santiklaas is St. Nicholas' feast
*
*/
todays_holiday(Holiday) :-
current_holiday(Time, Holiday),
get_time(Now),
Now - Time < 3600, !.
todays_holiday(Holiday) :-
year(Year),
todays_holiday(Year, Holiday),
get_time(Now),
retractall(current_holiday(_, _)),
asserta(current_holiday(Now, Holiday)).
todays_holiday(YY, april_fools_day) :-
date_between(YY-03-30, 12:00:00,
YY-04-02, 12:00:00).
todays_holiday(YY, christmas) :-
date_between(YY-12-20, 12:00:00,
YY-12-27, 12:00:00).
todays_holiday(YY, koningsdag) :-
date_between(YY-04-26, 12:00:00,
YY-04-28, 12:00:00).
todays_holiday(YY, santiklaas) :-
date_between(YY-12-05, 12:00:00,
YY-12-06, 12:00:00).
todays_holiday(YY, halloween) :-
date_between(YY-10-30, 12:00:00,
YY-11-01, 12:00:00).
todays_holiday(YY, liberation_day) :-
date_between(YY-05-04, 12:00:00,
YY-05-06, 12:00:00).
todays_holiday(YY, carnival) :-
carnival_date(Start, End),
Start = (YY-_-_),
End = (YY-_-_),
date_between(Start, 12:00:00,
End, 12:00:00).
todays_holiday(YY, chinese_new_year) :-
chinese_new_year_date(Start, End),
Start = (YY-_-_),
End = (YY-_-_),
date_between(Start, 12:00:00,
End, 12:00:00).
todays_holiday(_, none).
carnival_date(2015-2-15, 2015-2-17).
carnival_date(2016-2-07, 2016-2-09).
carnival_date(2017-2-26, 2017-2-28).
carnival_date(2018-2-11, 2018-2-13).
carnival_date(2019-3-03, 2019-3-05).
carnival_date(2020-2-23, 2020-2-25).
carnival_date(2021-2-14, 2021-2-16).
carnival_date(2022-2-27, 2022-2-29).
carnival_date(2023-2-19, 2023-2-21).
carnival_date(2024-2-11, 2025-2-13).
carnival_date(2025-3-02, 2025-3-04).
chinese_new_year_date(2015-02-19,2015-02-20).
chinese_new_year_date(2016-02-08,2016-02-09).
chinese_new_year_date(2017-01-28,2017-01-29).
chinese_new_year_date(2018-02-16,2018-02-17).
chinese_new_year_date(2019-02-05,2019-02-06).
chinese_new_year_date(2020-01-25,2020-01-26).
chinese_new_year_date(2021-02-12,2021-02-13).
chinese_new_year_date(2022-02-01,2022-02-02).
chinese_new_year_date(2023-01-22,2023-01-23).
chinese_new_year_date(2024-02-10,2024-02-11).
chinese_new_year_date(2025-01-29,2025-01-30).
chinese_new_year_date(2026-02-17,2026-02-18).
chinese_new_year_date(2027-02-06,2027-02-07).
chinese_new_year_date(2028-01-26,2028-01-27).
chinese_new_year_date(2029-02-13,2029-02-14).
chinese_new_year_date(2030-02-03,2030-02-04).
/**
* chinese_new_year_animal(?Year, ?Animal).
*
* Succeeds iff Animal matches the Chinese zodiac animal for Year.
*/
chinese_new_year_animal(2015, 'Sheep').
chinese_new_year_animal(2016, 'Monkey').
chinese_new_year_animal(2017, 'Rooster').
chinese_new_year_animal(2018, 'Dog').
chinese_new_year_animal(2019, 'Pig').
chinese_new_year_animal(2020, 'Rat').
chinese_new_year_animal(2021, 'Ox').
chinese_new_year_animal(2022, 'Tiger').
chinese_new_year_animal(2023, 'Rabbit').
chinese_new_year_animal(2024, 'Dragon').
chinese_new_year_animal(2025, 'Snake').
chinese_new_year_animal(2026, 'Horse').
chinese_new_year_animal(2027, 'Sheep').
chinese_new_year_animal(2028, 'Monkey').
chinese_new_year_animal(2029, 'Rooster').
chinese_new_year_animal(2030, 'Dog').
%% year(-Year)
%
% True when Year is the current year
year(Year) :-
get_time(Now),
stamp_date_time(Now, Term, 'UTC'),
date_time_value(year, Term, Year).
date_between(SDate, STime, EDate, ETime) :-
get_time(Now),
stamp(SDate, STime, Start), Now >= Start,
stamp(EDate, ETime, End), Now =< End.
stamp(YY-MM-DD, H:M:S, Time) :-
date_time_stamp(date(YY,MM,DD,H,M,S,0,'UTC',-), Time).