------------------------------------------------------------------------------
-- --
--- GNAT RUNTIME COMPONENTS --
+-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . C A L E N D A R --
-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2002 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- 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. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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 is the Alpha/VMS version.
+-- This is the Alpha/VMS version
with System.OS_Primitives;
package Ada.Calendar is
Time_Error : exception;
+ Unimplemented : exception;
+
private
pragma Inline (Clock);
-- Relative Time is positive, whereas relative OS_Time is negative,
-- but this declaration makes for easier conversion.
+ -- The following package provides handling of leap seconds. It is
+ -- used by Ada.Calendar.Arithmetic and Ada.Calendar.Formatting, both
+ -- Ada 2005 children of Ada.Calendar.
+
+ package Leap_Sec_Ops is
+
+ After_Last_Leap : constant Time := Time'Last;
+ -- Bigger by far than any leap second value. Not within range of
+ -- Ada.Calendar specified dates.
+
+ procedure Cumulative_Leap_Secs
+ (Start_Date : Time;
+ End_Date : Time;
+ Leaps_Between : out Duration;
+ Next_Leap_Sec : out Time);
+ -- Leaps_Between is the sum of the leap seconds that have occured
+ -- on or after Start_Date and before (strictly before) End_Date.
+ -- Next_Leap_Sec represents the next leap second occurence on or
+ -- after End_Date. If there are no leaps seconds after End_Date,
+ -- After_Last_Leap is returned. This does not provide info about
+ -- the next leap second (pos/neg or ?). After_Last_Leap can be used
+ -- as End_Date to count all the leap seconds that have occured on
+ -- or after Start_Date.
+ --
+ -- Important Notes: any fractional parts of Start_Date and End_Date
+ -- are discarded before the calculations are done. For instance: if
+ -- 113 seconds is a leap second (it isn't) and 113.5 is input as an
+ -- End_Date, the leap second at 113 will not be counted in
+ -- Leaps_Between, but it will be returned as Next_Leap_Sec. Thus, if
+ -- the caller wants to know if the End_Date is a leap second, the
+ -- comparison should be:
+ --
+ -- End_Date >= Next_Leap_Sec;
+ --
+ -- After_Last_Leap is designed so that this comparison works without
+ -- having to first check if Next_Leap_Sec is a valid leap second.
+
+ function All_Leap_Seconds return Duration;
+ -- Returns the sum off all of the leap seoncds.
+
+ end Leap_Sec_Ops;
+
+ procedure Split_With_Offset
+ (Date : Time;
+ Year : out Year_Number;
+ Month : out Month_Number;
+ Day : out Day_Number;
+ Seconds : out Day_Duration;
+ Offset : out Long_Integer);
+ -- Split_W_Offset has the same spec as Split with the addition of an
+ -- offset value which give the offset of the local time zone from UTC
+ -- at the input Date. This value comes for free during the implementation
+ -- of Split and is needed by UTC_Time_Offset. The returned Offset time
+ -- is straight from the C tm struct and is in seconds. If the system
+ -- dependent code has no way to find the offset it will return the value
+ -- Invalid_TZ_Offset declared below. Otherwise no checking is done, so
+ -- it is up to the user to check both for Invalid_TZ_Offset and otherwise
+ -- for a value that is acceptable.
+
+ Invalid_TZ_Offset : Long_Integer;
+ pragma Import (C, Invalid_TZ_Offset, "__gnat_invalid_tzoff");
+
end Ada.Calendar;
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