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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) 2009-2012, 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. --
-- --
------------------------------------------------------------------------------
package body Ada.Calendar.Time_Zones is
--------------------------
-- Implementation Notes --
--------------------------
-- All operations in this package are target and time representation
-- independent, thus only one source file is needed for multiple targets.
---------------------
-- UTC_Time_Offset --
---------------------
function UTC_Time_Offset (Date : Time := Clock) return Time_Offset is
Offset_L : constant Long_Integer :=
Time_Zones_Operations.UTC_Time_Offset (Date);
Offset : Time_Offset;
begin
if Offset_L = Invalid_Time_Zone_Offset then
raise Unknown_Zone_Error;
end if;
-- The offset returned by Time_Zones_Operations.UTC_Time_Offset is in
-- seconds, the returned value needs to be in minutes.
Offset := Time_Offset (Offset_L / 60);
-- Validity checks
if not Offset'Valid then
raise Unknown_Zone_Error;
end if;
return Offset;
end UTC_Time_Offset;
end Ada.Calendar.Time_Zones;
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