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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . C A L E N D A R . T I M E _ Z O N E S --
-- --
-- B o d y --
-- --
-- Copyright (C) 2006, 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. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
package body Ada.Calendar.Time_Zones is
---------------------
-- UTC_Time_Offset --
---------------------
function UTC_Time_Offset (Date : Time := Clock) return Time_Offset is
Year : Year_Number;
Month : Month_Number;
Day : Day_Number;
Seconds : Day_Duration;
Offset : Long_Integer;
begin
Split_With_Offset (Date, Year, Month, Day, Seconds, Offset);
-- The system dependent code does not support time zones
if Offset = Invalid_TZ_Offset then
raise Unknown_Zone_Error;
end if;
Offset := Offset / 60;
if Offset < Long_Integer (Time_Offset'First)
or else Offset > Long_Integer (Time_Offset'Last)
then
raise Unknown_Zone_Error;
end if;
return Time_Offset (Offset);
end UTC_Time_Offset;
end Ada.Calendar.Time_Zones;
|
