1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- A D A . C A L E N D A R . T I M E _ Z O N E S --
9 -- Copyright (C) 2006, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 package body Ada
.Calendar
.Time_Zones
is
40 function UTC_Time_Offset
(Date
: Time
:= Clock
) return Time_Offset
is
44 Seconds
: Day_Duration
;
45 Offset
: Long_Integer;
48 Split_With_Offset
(Date
, Year
, Month
, Day
, Seconds
, Offset
);
50 -- The system dependent code does not support time zones
52 if Offset
= Invalid_TZ_Offset
then
53 raise Unknown_Zone_Error
;
56 Offset
:= Offset
/ 60;
58 if Offset
< Long_Integer (Time_Offset
'First)
59 or else Offset
> Long_Integer (Time_Offset
'Last)
61 raise Unknown_Zone_Error
;
64 return Time_Offset
(Offset
);
67 end Ada
.Calendar
.Time_Zones
;