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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) 1992-2009, 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. --
--- --
-------------------------------------------------------------------------------
-
-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;
-
- -- A Day_Duration value of 86_400.0 designates a new day
-
- subtype Day_Duration is Duration range 0.0 .. 86_400.0;
-
- 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 (">=");
-
- -- The units used in this version of Ada.Calendar are nanoseconds. The
- -- following constants provide values used in conversions of seconds or
- -- days to the underlying units.
-
- Nano : constant := 1_000_000_000;
- Nano_F : constant := 1_000_000_000.0;
- Nanos_In_Day : constant := 86_400_000_000_000;
- Secs_In_Day : constant := 86_400;
-
- ----------------------------
- -- Implementation of Time --
- ----------------------------
-
- -- Time is represented as a signed 64 bit integer count of nanoseconds
- -- since the start of Ada time (1901-01-01 00:00:00.0 UTC). Time values
- -- produced by Time_Of are internally normalized to UTC regardless of their
- -- local time zone. This representation ensures correct handling of leap
- -- seconds as well as performing arithmetic. In Ada 95, Split and Time_Of
- -- will treat a time value as being in the local time zone, in Ada 2005,
- -- Split and Time_Of will treat a time value as being in the designated
- -- time zone by the formal parameter or in UTC by default. The size of the
- -- type is large enough to cover the Ada 2005 range of time (1901-01-01
- -- 00:00:00.0 UTC - 2399-12-31-23:59:59.999999999 UTC).
-
- ------------------
- -- Leap seconds --
- ------------------
-
- -- Due to Earth's slowdown, the astronomical time is not as precise as the
- -- International Atomic Time. To compensate for this inaccuracy, a single
- -- leap second is added after the last day of June or December. The count
- -- of seconds during those occurrences becomes:
-
- -- ... 58, 59, leap second 60, 0, 1, 2 ...
-
- -- Unlike leap days, leap seconds occur simultaneously around the world.
- -- In other words, if a leap second occurs at 23:59:60 UTC, it also occurs
- -- on 18:59:60 -5 the same day or 2:59:60 +2 on the next day.
-
- -- Leap seconds do not follow a formula. The International Earth Rotation
- -- and Reference System Service decides when to add one. Leap seconds are
- -- included in the representation of time in Ada 95 mode. As a result,
- -- the following two time values will differ by two seconds:
-
- -- 1972-06-30 23:59:59.0
- -- 1972-07-01 00:00:00.0
-
- -- When a new leap second is introduced, the following steps must be
- -- carried out:
-
- -- 1) Increment Leap_Seconds_Count in a-calend.adb by one
- -- 2) Increment LS_Count in xleaps.adb by one
- -- 3) Add the new date to the aggregate of array LS_Dates in
- -- xleaps.adb
- -- 4) Compile and execute xleaps
- -- 5) Replace the values of Leap_Second_Times in a-calend.adb with the
- -- aggregate generated by xleaps
-
- -- The algorithms that build the actual leap second values and discover
- -- how many leap seconds have occurred between two dates do not need any
- -- modification.
-
- ------------------------------
- -- Non-leap centennial years --
- ------------------------------
-
- -- Over the range of Ada time, centennial years 2100, 2200 and 2300 are
- -- non-leap. As a consequence, seven non-leap years occur over the period
- -- of year - 4 to year + 4. Internally, routines Split and Time_Of add or
- -- subtract a "fake" February 29 to facilitate the arithmetic involved.
-
- -- The underlying type of Time has been chosen to be a 64 bit signed
- -- integer number since it allows for easier processing of sub seconds
- -- and arithmetic.
-
- type Time_Rep is range -2 ** 63 .. +2 ** 63 - 1;
- type Time is new Time_Rep;
-
- Days_In_Month : constant array (Month_Number) of Day_Number :=
- (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
-
- 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
-
- -- The following packages provide a target independent interface to the
- -- children of Calendar - Arithmetic, Conversions, Delays, Formatting and
- -- Time_Zones.
-
- ---------------------------
- -- 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;
-
- ----------------------
- -- Delay_Operations --
- ----------------------
-
- package Delay_Operations is
-
- function To_Duration (Date : Time) return Duration;
- -- Given a time value in nanoseconds since 1901, convert it into a
- -- duration value giving the number of nanoseconds since the Unix Epoch.
-
- end Delay_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;
- Is_Ada_05 : Boolean;
- Time_Zone : Long_Integer);
- -- Split a time value into its components. Set Is_Ada_05 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 := False;
- Use_Day_Secs : Boolean := False;
- Is_Ada_05 : Boolean := False;
- Time_Zone : Long_Integer := 0) return Time;
- -- 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. Set Is_Ada_05 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 the offset in seconds from UTC
-
- end Time_Zones_Operations;
-
-end Ada.Calendar;