New Language: Ada

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--                         G N A T . C A L E N D A R                        --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                            $Revision: 1.5 $
+--                                                                          --
+--          Copyright (C) 1999-2001 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 2,  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.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  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 Public License.                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  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
+--  valueas 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);
+
+   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;
+
+   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, Sedond 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;
+   --  Returns the day number in the year. (1st January is day 1 and 31st
+   --  December is day 365 or 366 for leap year).
+
+   function Week_In_Year (Date : Ada.Calendar.Time) return Week_In_Year_Number;
+   --  Returns the week number in the year with Monday as first day of week
+
+   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 the standard Ada.Calendar.Time data in date data (Year, Month,
+   --  Day) and Time data (Hour, Minute, Second, Sub_Second)
+
+   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;
+   --  Returns an Ada.Calendar.Time data built from the date and time values.
+
+   --  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 : 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.
+end GNAT.Calendar;