68 lines
3.3 KiB
Ada
68 lines
3.3 KiB
Ada
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------------------------------------------------------------------------------
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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) 2006, 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 2, 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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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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-- 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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Year : Year_Number;
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Month : Month_Number;
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Day : Day_Number;
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Seconds : Day_Duration;
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Offset : Long_Integer;
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begin
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Split_With_Offset (Date, Year, Month, Day, Seconds, Offset);
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-- The system dependent code does not support time zones
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if Offset = Invalid_TZ_Offset then
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raise Unknown_Zone_Error;
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end if;
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Offset := Offset / 60;
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if Offset < Long_Integer (Time_Offset'First)
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or else Offset > Long_Integer (Time_Offset'Last)
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then
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raise Unknown_Zone_Error;
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end if;
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return Time_Offset (Offset);
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end UTC_Time_Offset;
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end Ada.Calendar.Time_Zones;
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