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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . C A L E N D A R . T I M E _ Z O N E S --
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6 -- --
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7 -- B o d y --
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8 -- --
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131
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9 -- Copyright (C) 2009-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 package body Ada.Calendar.Time_Zones is
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33
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34 --------------------------
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35 -- Implementation Notes --
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36 --------------------------
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37
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38 -- All operations in this package are target and time representation
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39 -- independent, thus only one source file is needed for multiple targets.
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40
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41 ---------------------
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42 -- UTC_Time_Offset --
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43 ---------------------
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44
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45 function UTC_Time_Offset (Date : Time := Clock) return Time_Offset is
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46 Offset_L : constant Long_Integer :=
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47 Time_Zones_Operations.UTC_Time_Offset (Date);
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48 Offset : Time_Offset;
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49
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50 begin
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51 if Offset_L = Invalid_Time_Zone_Offset then
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52 raise Unknown_Zone_Error;
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53 end if;
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54
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55 -- The offset returned by Time_Zones_Operations.UTC_Time_Offset is in
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56 -- seconds, the returned value needs to be in minutes.
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57
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58 Offset := Time_Offset (Offset_L / 60);
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59
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60 -- Validity checks
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61
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62 if not Offset'Valid then
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63 raise Unknown_Zone_Error;
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64 end if;
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65
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66 return Offset;
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67 end UTC_Time_Offset;
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68
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69 end Ada.Calendar.Time_Zones;
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