-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2005 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2008, 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
package OSP renames System.OS_Primitives;
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).
+ -- 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 .. 2099;
+ subtype Year_Number is Integer range 1901 .. 2399;
subtype Month_Number is Integer range 1 .. 12;
subtype Day_Number is Integer range 1 .. 31;
(Year : Year_Number;
Month : Month_Number;
Day : Day_Number;
- Seconds : Day_Duration := 0.0)
- return Time;
+ Seconds : Day_Duration := 0.0) return Time;
function "+" (Left : Time; Right : Duration) return Time;
function "+" (Left : Duration; Right : Time) return Time;
Time_Error : exception;
private
-
pragma Inline (Clock);
pragma Inline (Year);
pragma Inline (">");
pragma Inline (">=");
- -- Time is represented as the number of 100-nanosecond (ns) units offset
- -- from the system base date and time, which is 00:00 o'clock,
- -- November 17, 1858 (the Smithsonian base date and time for the
- -- astronomic calendar).
+ -- 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;
- -- The time value stored is typically a GMT value, as provided in standard
+ -- 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.
- type Time is new OSP.OS_Time;
-
-- 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 OSP.OS_Time;
+
+ 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, 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;
+ 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;
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