| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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 |
| |
| -------------------------- |
| -- 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; |
