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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- A D A . C A L E N D A R --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2012, 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 --
+-- apply solely to the contents of the part following the private keyword. --
+-- --
+-- 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 3, 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. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the OpenVMS version
+
+with System.OS_Primitives;
+
+package Ada.Calendar is
+
+ type Time is private;
+
+ -- Declarations representing limits of allowed local time values. Note that
+ -- these do NOT constrain the possible stored values of time which may well
+ -- permit a larger range of times (this is explicitly allowed in Ada 95).
+
+ subtype Year_Number is Integer range 1901 .. 2399;
+ subtype Month_Number is Integer range 1 .. 12;
+ subtype Day_Number is Integer range 1 .. 31;
+
+ subtype Day_Duration is Duration range 0.0 .. 86_400.0;
+ -- Note that a value of 86_400.0 is the start of the next day
+
+ function Clock return Time;
+ -- The returned time value is the number of nanoseconds since the start
+ -- of Ada time (1901-01-01 00:00:00.0 UTC). If leap seconds are enabled,
+ -- the result will contain all elapsed leap seconds since the start of
+ -- Ada time until now.
+
+ function Year (Date : Time) return Year_Number;
+ function Month (Date : Time) return Month_Number;
+ function Day (Date : Time) return Day_Number;
+ function Seconds (Date : Time) return Day_Duration;
+
+ procedure Split
+ (Date : Time;
+ Year : out Year_Number;
+ Month : out Month_Number;
+ Day : out Day_Number;
+ Seconds : out Day_Duration);
+ -- Break down a time value into its date components set in the current
+ -- time zone. If Split is called on a time value created using Ada 2005
+ -- Time_Of in some arbitrary time zone, the input value will always be
+ -- interpreted as relative to the local time zone.
+
+ function Time_Of
+ (Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Seconds : Day_Duration := 0.0) return Time;
+ -- GNAT Note: Normally when procedure Split is called on a Time value
+ -- result of a call to function Time_Of, the out parameters of procedure
+ -- Split are identical to the in parameters of function Time_Of. However,
+ -- when a non-existent time of day is specified, the values for Seconds
+ -- may or may not be different. This may happen when Daylight Saving Time
+ -- (DST) is in effect, on the day when switching to DST, if Seconds
+ -- specifies a time of day in the hour that does not exist. For example,
+ -- in New York:
+ --
+ -- Time_Of (Year => 1998, Month => 4, Day => 5, Seconds => 10740.0)
+ --
+ -- will return a Time value T. If Split is called on T, the resulting
+ -- Seconds may be 14340.0 (3:59:00) instead of 10740.0 (2:59:00 being
+ -- a time that not exist).
+
+ function "+" (Left : Time; Right : Duration) return Time;
+ function "+" (Left : Duration; Right : Time) return Time;
+ function "-" (Left : Time; Right : Duration) return Time;
+ function "-" (Left : Time; Right : Time) return Duration;
+ -- The first three functions will raise Time_Error if the resulting time
+ -- value is less than the start of Ada time in UTC or greater than the
+ -- end of Ada time in UTC. The last function will raise Time_Error if the
+ -- resulting difference cannot fit into a duration value.
+
+ function "<" (Left, Right : Time) return Boolean;
+ function "<=" (Left, Right : Time) return Boolean;
+ function ">" (Left, Right : Time) return Boolean;
+ function ">=" (Left, Right : Time) return Boolean;
+
+ Time_Error : exception;
+
+private
+ pragma Inline (Clock);
+
+ pragma Inline (Year);
+ pragma Inline (Month);
+ pragma Inline (Day);
+
+ pragma Inline ("+");
+ pragma Inline ("-");
+
+ pragma Inline ("<");
+ pragma Inline ("<=");
+ pragma Inline (">");
+ pragma Inline (">=");
+
+ -- Although the units are 100 nanoseconds, for the purpose of better
+ -- readability, this unit will be called "mili".
+
+ Mili : constant := 10_000_000;
+ Mili_F : constant := 10_000_000.0;
+ Milis_In_Day : constant := 864_000_000_000;
+ Secs_In_Day : constant := 86_400;
+
+ -- Time is represented as the number of 100-nanosecond (ns) units from the
+ -- system base date and time 1858-11-17 0.0 (the Smithsonian base date and
+ -- time for the astronomic calendar).
+
+ -- The time value stored is typically a UTC value, as provided in standard
+ -- Unix environments. If this is the case then Split and Time_Of perform
+ -- required conversions to and from local times.
+
+ -- Notwithstanding this definition, Time is not quite the same as OS_Time.
+ -- Relative Time is positive, whereas relative OS_Time is negative,
+ -- but this declaration makes for easier conversion.
+
+ type Time is new System.OS_Primitives.OS_Time;
+
+ Days_In_Month : constant array (Month_Number) of Day_Number :=
+ (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
+ -- Days in month for non-leap year, leap year case is adjusted in code
+
+ Invalid_Time_Zone_Offset : Long_Integer;
+ pragma Import (C, Invalid_Time_Zone_Offset, "__gnat_invalid_tzoff");
+
+ function Is_Leap (Year : Year_Number) return Boolean;
+ -- Determine whether a given year is leap
+
+ ----------------------------------------------------------
+ -- Target-Independent Interface to Children of Calendar --
+ ----------------------------------------------------------
+
+ -- The following packages provide a target-independent interface to the
+ -- children of Calendar - Arithmetic, Conversions, Delays, Formatting and
+ -- Time_Zones.
+
+ -- NOTE: Delays does not need a target independent interface because
+ -- VMS already has a target specific file for that package.
+
+ ---------------------------
+ -- Arithmetic_Operations --
+ ---------------------------
+
+ package Arithmetic_Operations is
+
+ function Add (Date : Time; Days : Long_Integer) return Time;
+ -- Add a certain number of days to a time value
+
+ procedure Difference
+ (Left : Time;
+ Right : Time;
+ Days : out Long_Integer;
+ Seconds : out Duration;
+ Leap_Seconds : out Integer);
+ -- Calculate the difference between two time values in terms of days,
+ -- seconds and leap seconds elapsed. The leap seconds are not included
+ -- in the seconds returned. If Left is greater than Right, the returned
+ -- values are positive, negative otherwise.
+
+ function Subtract (Date : Time; Days : Long_Integer) return Time;
+ -- Subtract a certain number of days from a time value
+
+ end Arithmetic_Operations;
+
+ ---------------------------
+ -- Conversion_Operations --
+ ---------------------------
+
+ package Conversion_Operations is
+
+ function To_Ada_Time (Unix_Time : Long_Integer) return Time;
+ -- Unix to Ada Epoch conversion
+
+ function To_Ada_Time
+ (tm_year : Integer;
+ tm_mon : Integer;
+ tm_day : Integer;
+ tm_hour : Integer;
+ tm_min : Integer;
+ tm_sec : Integer;
+ tm_isdst : Integer) return Time;
+ -- Struct tm to Ada Epoch conversion
+
+ function To_Duration
+ (tv_sec : Long_Integer;
+ tv_nsec : Long_Integer) return Duration;
+ -- Struct timespec to Duration conversion
+
+ procedure To_Struct_Timespec
+ (D : Duration;
+ tv_sec : out Long_Integer;
+ tv_nsec : out Long_Integer);
+ -- Duration to struct timespec conversion
+
+ procedure To_Struct_Tm
+ (T : Time;
+ tm_year : out Integer;
+ tm_mon : out Integer;
+ tm_day : out Integer;
+ tm_hour : out Integer;
+ tm_min : out Integer;
+ tm_sec : out Integer);
+ -- Time to struct tm conversion
+
+ function To_Unix_Time (Ada_Time : Time) return Long_Integer;
+ -- Ada to Unix Epoch conversion
+
+ end Conversion_Operations;
+
+ ---------------------------
+ -- Formatting_Operations --
+ ---------------------------
+
+ package Formatting_Operations is
+
+ function Day_Of_Week (Date : Time) return Integer;
+ -- Determine which day of week Date falls on. The returned values are
+ -- within the range of 0 .. 6 (Monday .. Sunday).
+
+ procedure Split
+ (Date : Time;
+ Year : out Year_Number;
+ Month : out Month_Number;
+ Day : out Day_Number;
+ Day_Secs : out Day_Duration;
+ Hour : out Integer;
+ Minute : out Integer;
+ Second : out Integer;
+ Sub_Sec : out Duration;
+ Leap_Sec : out Boolean;
+ Use_TZ : Boolean;
+ Is_Historic : Boolean;
+ Time_Zone : Long_Integer);
+ pragma Export (Ada, Split, "__gnat_split");
+ -- Split a time value into its components. If flag Is_Historic is set,
+ -- this routine would try to use to the best of the OS's abilities the
+ -- time zone offset that was or will be in effect on Date. Set Use_TZ
+ -- to use the local time zone (the value in Time_Zone is ignored) when
+ -- splitting a time value.
+
+ function Time_Of
+ (Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Day_Secs : Day_Duration;
+ Hour : Integer;
+ Minute : Integer;
+ Second : Integer;
+ Sub_Sec : Duration;
+ Leap_Sec : Boolean;
+ Use_Day_Secs : Boolean;
+ Use_TZ : Boolean;
+ Is_Historic : Boolean;
+ Time_Zone : Long_Integer) return Time;
+ pragma Export (Ada, Time_Of, "__gnat_time_of");
+ -- Given all the components of a date, return the corresponding time
+ -- value. Set Use_Day_Secs to use the value in Day_Secs, otherwise the
+ -- day duration will be calculated from Hour, Minute, Second and Sub_
+ -- Sec. If flag Is_Historic is set, this routine would try to use to the
+ -- best of the OS's abilities the time zone offset that was or will be
+ -- in effect on the input date. Set Use_TZ to use the local time zone
+ -- (the value in formal Time_Zone is ignored) when building a time value
+ -- and to verify the validity of a requested leap second.
+
+ end Formatting_Operations;
+
+ ---------------------------
+ -- Time_Zones_Operations --
+ ---------------------------
+
+ package Time_Zones_Operations is
+
+ function UTC_Time_Offset (Date : Time) return Long_Integer;
+ -- Return (in seconds) the difference between the local time zone and
+ -- UTC time at a specific historic date.
+
+ end Time_Zones_Operations;
+
+end Ada.Calendar;