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jeremybenn |
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . C A L E N D A R . T I M E _ Z O N E S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2009-2012, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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package body Ada.Calendar.Time_Zones is
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--------------------------
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-- Implementation Notes --
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--------------------------
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-- All operations in this package are target and time representation
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-- independent, thus only one source file is needed for multiple targets.
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---------------------
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-- UTC_Time_Offset --
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---------------------
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function UTC_Time_Offset (Date : Time := Clock) return Time_Offset is
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Offset_L : constant Long_Integer :=
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Time_Zones_Operations.UTC_Time_Offset (Date);
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Offset : Time_Offset;
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begin
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if Offset_L = Invalid_Time_Zone_Offset then
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raise Unknown_Zone_Error;
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end if;
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-- The offset returned by Time_Zones_Operations.UTC_Time_Offset is in
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-- seconds, the returned value needs to be in minutes.
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Offset := Time_Offset (Offset_L / 60);
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-- Validity checks
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if not Offset'Valid then
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raise Unknown_Zone_Error;
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end if;
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return Offset;
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end UTC_Time_Offset;
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end Ada.Calendar.Time_Zones;
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