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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- A D A . C A L E N D A R . C O N V --
-- --
-- B o d y --
-- --
-- $Revision: 1.4 $ --
-- --
-- Copyright (C) 1996 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 is the Alpha/VMS version.
package body Ada.Calendar.Conv is
function Get_GMToff return Integer;
pragma Import (C, Get_GMToff, "get_gmtoff");
VMS_Epoch_Offset : constant Long_Integer
:= 10_000_000 * (3_506_716_800 + Long_Integer (Get_GMToff));
--------------------------
-- To_Absolute_Duration --
--------------------------
function To_Absolute_Duration (T : Time) return Duration is
begin
return Duration'Fixed_Value
((Long_Integer (T) - VMS_Epoch_Offset) * 100);
end To_Absolute_Duration;
function To_Relative_Duration (T : Time) return Duration is
pragma Unsuppress (Overflow_Check);
begin
return Duration'Fixed_Value (Long_Integer (T) * 100);
end To_Relative_Duration;
----------------------
-- To_Absolute_Time --
----------------------
function To_Absolute_Time (D : Duration) return Time is
begin
return Time ((Long_Integer'Integer_Value (D) / 100) + VMS_Epoch_Offset);
end To_Absolute_Time;
function To_Relative_Time (D : Duration) return Time is
begin
return Time (Long_Integer'Integer_Value (D) / 100);
end To_Relative_Time;
end Ada.Calendar.Conv;
|
