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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- G N A T . C A L E N D A R --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1999-2012, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package extends Ada.Calendar to handle Hour, Minute, Second,
+-- Second_Duration and Day_Of_Week and Day_In_Year from Calendar.Time.
+-- Second_Duration precision depends on the target clock precision.
+--
+-- GNAT.Calendar provides the same kind of abstraction found in Ada.Calendar.
+-- It provides Split and Time_Of to build and split a Time data. And it
+-- provides accessor functions to get only one of Hour, Minute, Second,
+-- Second_Duration. Other functions are to access more advanced values like
+-- Day_Of_Week, Day_In_Year and Week_In_Year.
+
+with Ada.Calendar;
+with Interfaces.C;
+
+package GNAT.Calendar is
+
+ type Day_Name is
+ (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday);
+ pragma Ordered (Day_Name);
+
+ subtype Hour_Number is Natural range 0 .. 23;
+ subtype Minute_Number is Natural range 0 .. 59;
+ subtype Second_Number is Natural range 0 .. 59;
+ subtype Second_Duration is Ada.Calendar.Day_Duration range 0.0 .. 1.0;
+ subtype Day_In_Year_Number is Positive range 1 .. 366;
+ subtype Week_In_Year_Number is Positive range 1 .. 53;
+
+ No_Time : constant Ada.Calendar.Time;
+ -- A constant set to the first date that can be represented by the type
+ -- Time. It can be used to indicate an uninitialized date.
+
+ function Hour (Date : Ada.Calendar.Time) return Hour_Number;
+ function Minute (Date : Ada.Calendar.Time) return Minute_Number;
+ function Second (Date : Ada.Calendar.Time) return Second_Number;
+ function Sub_Second (Date : Ada.Calendar.Time) return Second_Duration;
+ -- Hour, Minute, Second and Sub_Second returns the complete time data for
+ -- the Date (H:M:S.SS). See Ada.Calendar for Year, Month, Day accessors.
+ -- Second_Duration precision depends on the target clock precision.
+
+ function Day_Of_Week (Date : Ada.Calendar.Time) return Day_Name;
+ -- Return the day name
+
+ function Day_In_Year (Date : Ada.Calendar.Time) return Day_In_Year_Number;
+ -- Return the day number in the year. (1st January is day 1 and 31st
+ -- December is day 365 or 366 for leap year).
+
+ procedure Split
+ (Date : Ada.Calendar.Time;
+ Year : out Ada.Calendar.Year_Number;
+ Month : out Ada.Calendar.Month_Number;
+ Day : out Ada.Calendar.Day_Number;
+ Hour : out Hour_Number;
+ Minute : out Minute_Number;
+ Second : out Second_Number;
+ Sub_Second : out Second_Duration);
+ -- Split a standard Ada.Calendar.Time value in date data (Year, Month, Day)
+ -- and Time data (Hour, Minute, Second, Sub_Second).
+
+ procedure Split_At_Locale
+ (Date : Ada.Calendar.Time;
+ Year : out Ada.Calendar.Year_Number;
+ Month : out Ada.Calendar.Month_Number;
+ Day : out Ada.Calendar.Day_Number;
+ Hour : out Hour_Number;
+ Minute : out Minute_Number;
+ Second : out Second_Number;
+ Sub_Second : out Second_Duration);
+ -- Split a standard Ada.Calendar.Time value in date data (Year, Month, Day)
+ -- and Time data (Hour, Minute, Second, Sub_Second). This version of Split
+ -- utilizes the time zone and DST bias of the locale (equivalent to Clock).
+ -- Due to this simplified behavior, the implementation does not require
+ -- expensive system calls on targets such as Windows.
+ -- WARNING: Split_At_Locale is no longer aware of historic events and may
+ -- produce inaccurate results over DST changes which occurred in the past.
+
+ function Time_Of
+ (Year : Ada.Calendar.Year_Number;
+ Month : Ada.Calendar.Month_Number;
+ Day : Ada.Calendar.Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration := 0.0) return Ada.Calendar.Time;
+ -- Return an Ada.Calendar.Time data built from the date and time values
+
+ function Time_Of_At_Locale
+ (Year : Ada.Calendar.Year_Number;
+ Month : Ada.Calendar.Month_Number;
+ Day : Ada.Calendar.Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration := 0.0) return Ada.Calendar.Time;
+ -- Return an Ada.Calendar.Time data built from the date and time values.
+ -- This version of Time_Of utilizes the time zone and DST bias of the
+ -- locale (equivalent to Clock). Due to this simplified behavior, the
+ -- implementation does not require expensive system calls on targets such
+ -- as Windows.
+ -- WARNING: Split_At_Locale is no longer aware of historic events and may
+ -- produce inaccurate results over DST changes which occurred in the past.
+
+ function Week_In_Year (Date : Ada.Calendar.Time) return Week_In_Year_Number;
+ -- Return the week number as defined in ISO 8601. A week always starts on
+ -- a Monday and the first week of a particular year is the one containing
+ -- the first Thursday. A year may have 53 weeks when January 1st is a
+ -- Wednesday and the year is leap or January 1st is a Thursday. Note that
+ -- the last days of December may belong to the first week on the next year
+ -- and conversely, the first days of January may belong to the last week
+ -- of the last year.
+
+ procedure Year_Week_In_Year
+ (Date : Ada.Calendar.Time;
+ Year : out Ada.Calendar.Year_Number;
+ Week : out Week_In_Year_Number);
+ -- Return the week number as defined in ISO 8601 along with the year in
+ -- which the week occurs.
+
+ -- C timeval conversion
+
+ -- C timeval represent a duration (used in Select for example). This
+ -- structure is composed of a number of seconds and a number of micro
+ -- seconds. The timeval structure is not exposed here because its
+ -- definition is target dependent. Interface to C programs is done via a
+ -- pointer to timeval structure.
+
+ type timeval is private;
+
+ function To_Duration (T : not null access timeval) return Duration;
+ function To_Timeval (D : Duration) return timeval;
+
+private
+ -- This is a dummy declaration that should be the largest possible timeval
+ -- structure of all supported targets.
+
+ type timeval is array (1 .. 2) of Interfaces.C.long;
+
+ function Julian_Day
+ (Year : Ada.Calendar.Year_Number;
+ Month : Ada.Calendar.Month_Number;
+ Day : Ada.Calendar.Day_Number) return Integer;
+ -- Compute Julian day number
+ --
+ -- The code of this function is a modified version of algorithm 199 from
+ -- the Collected Algorithms of the ACM. The author of algorithm 199 is
+ -- Robert G. Tantzen.
+
+ No_Time : constant Ada.Calendar.Time :=
+ Ada.Calendar.Time_Of
+ (Ada.Calendar.Year_Number'First,
+ Ada.Calendar.Month_Number'First,
+ Ada.Calendar.Day_Number'First);
+
+end GNAT.Calendar;