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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- A D A . C A L E N D A R --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
+-- --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. The copyright notice above, and the license provisions that follow --
+-- apply solely to the contents of the part following the private keyword. --
+-- --
+-- 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, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the Alpha/VMS version
+
+with System.OS_Primitives;
+package Ada.Calendar is
+
+ package OSP renames System.OS_Primitives;
+
+ type Time is private;
+
+ -- Declarations representing limits of allowed local time values. Note that
+ -- these do NOT constrain the possible stored values of time which may well
+ -- permit a larger range of times (this is explicitly allowed in Ada 95).
+
+ subtype Year_Number is Integer range 1901 .. 2099;
+ subtype Month_Number is Integer range 1 .. 12;
+ subtype Day_Number is Integer range 1 .. 31;
+
+ subtype Day_Duration is Duration range 0.0 .. 86_400.0;
+
+ function Clock return Time;
+
+ function Year (Date : Time) return Year_Number;
+ function Month (Date : Time) return Month_Number;
+ function Day (Date : Time) return Day_Number;
+ function Seconds (Date : Time) return Day_Duration;
+
+ procedure Split
+ (Date : Time;
+ Year : out Year_Number;
+ Month : out Month_Number;
+ Day : out Day_Number;
+ Seconds : out Day_Duration);
+
+ function Time_Of
+ (Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Seconds : Day_Duration := 0.0)
+ return Time;
+
+ function "+" (Left : Time; Right : Duration) return Time;
+ function "+" (Left : Duration; Right : Time) return Time;
+ function "-" (Left : Time; Right : Duration) return Time;
+ function "-" (Left : Time; Right : Time) return Duration;
+
+ function "<" (Left, Right : Time) return Boolean;
+ function "<=" (Left, Right : Time) return Boolean;
+ function ">" (Left, Right : Time) return Boolean;
+ function ">=" (Left, Right : Time) return Boolean;
+
+ Time_Error : exception;
+
+private
+
+ pragma Inline (Clock);
+
+ pragma Inline (Year);
+ pragma Inline (Month);
+ pragma Inline (Day);
+
+ pragma Inline ("+");
+ pragma Inline ("-");
+
+ pragma Inline ("<");
+ pragma Inline ("<=");
+ pragma Inline (">");
+ pragma Inline (">=");
+
+ -- Time is represented as the number of 100-nanosecond (ns) units offset
+ -- from the system base date and time, which is 00:00 o'clock,
+ -- November 17, 1858 (the Smithsonian base date and time for the
+ -- astronomic calendar).
+
+ -- The time value stored is typically a GMT value, as provided in standard
+ -- Unix environments. If this is the case then Split and Time_Of perform
+ -- required conversions to and from local times.
+
+ type Time is new OSP.OS_Time;
+
+ -- Notwithstanding this definition, Time is not quite the same as OS_Time.
+ -- Relative Time is positive, whereas relative OS_Time is negative,
+ -- but this declaration makes for easier conversion.
+
+end Ada.Calendar;