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Ada Programming/Libraries/Ada.Calendar.Arithmetic - Wikibooks, open books for an open world

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This language feature is only available from Ada 2005 on.

Ada.Calendar.Arithmetic is a unit of the Predefined Language Environment since Ada 2005.

--                     Standard Ada library specification
--   Copyright (c) 2003-2018 Maxim Reznik <reznikmm@gmail.com>
--   Copyright (c) 2004-2016 AXE Consultants
--   Copyright (c) 2004, 2005, 2006 Ada-Europe
--   Copyright (c) 2000 The MITRE Corporation, Inc.
--   Copyright (c) 1992, 1993, 1994, 1995 Intermetrics, Inc.
--   SPDX-License-Identifier: BSD-3-Clause and LicenseRef-AdaReferenceManual
-- -------------------------------------------------------------------------

package Ada.Calendar.Arithmetic is

   --   Arithmetic on days:

   type Day_Count is
     range -366 * (1 + Year_Number'Last - Year_Number'First)
       ..  366 * (1 + Year_Number'Last - Year_Number'First);

   subtype Leap_Seconds_Count is Integer range -2047 .. 2047;

   procedure Difference (Left         : in     Time;
                         Right        : in     Time;
                         Days         :    out Day_Count;
                         Seconds      :    out Duration;
                         Leap_Seconds :    out Leap_Seconds_Count);

   function "+" (Left  : in Time;
                 Right : in Day_Count)
                return Time;

   function "+" (Left  : in Day_Count;
                 Right : in Time)
                return Time;

   function "-" (Left  : in Time;
                 Right : in Day_Count)
                return Time;

   function "-" (Left  : in Time;
                 Right : in Time)
                return Day_Count;

end Ada.Calendar.Arithmetic;

• Ada Programming/Libraries/Ada

• Search for examples of Ada.Calendar.Arithmetic in: Rosetta Code, GitHub (gists), any Alire crate or this Wikibook.
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• 9.6.1: Formatting, Time Zones, and other operations for Time ^[Annotated]

• 9.6.1: Formatting, Time Zones, and other operations for Time ^[Annotated]

FSF GNAT

• Specification: a-calari.ads
• Body: a-calari.adb

drake

• Specification: calendar/a-calari.ads
• Body: calendar/a-calari.adb

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