67 lines
1.3 KiB
Plaintext
67 lines
1.3 KiB
Plaintext
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:- protocol(datep).
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:- info([
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version is 1.0,
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authors is 'Paulo Moura',
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date is 2000/7/24,
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comment is 'Date protocol.']).
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:- public(today/3).
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:- mode(today(-integer, -integer, -integer), one).
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:- info(now/3, [
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comment is 'Returns current date.',
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argnames is ['Year', 'Month', 'Day']]).
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:- public(leap_year/1).
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:- mode(leap_year(+integer), zero_or_one).
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:- info(empty/1,
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[comment is 'True if the argument is a leap year.',
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argnames is ['Year']]).
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:- public(name_of_day/3).
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:- mode(name_of_day(?integer, ?atom, ?atom), zero_or_more).
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:- info(valid/3, [
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comment is 'Name and short name of day.',
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argnames is ['Index', 'Name', 'Short']]).
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:- public(name_of_month/3).
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:- mode(name_of_month(?integer, ?atom, ?atom), zero_or_more).
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:- info(valid/3, [
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comment is 'Name and short name of month.',
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argnames is ['Index', 'Name', 'Short']]).
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:- public(days_in_month/3).
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:- mode(days_in_month(?integer, +integer, ?integer), zero_or_more).
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:- info(valid/3, [
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comment is 'Number of days in a month.',
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argnames is ['Month', 'Year', 'Days']]).
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:- public(valid/3).
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:- mode(valid(@integer, @integer, @integer), zero_or_one).
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:- info(valid/3, [
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comment is 'True if the arguments represent a valid date.',
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argnames is ['Year', 'Month', 'Day']]).
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:- end_protocol.
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