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--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--                G N A T . C A L E N D A R . T I M E _ I O                 --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--                     Copyright (C) 1999-2008, AdaCore                     --

--                                                                          --

-- 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 2,  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.  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,  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  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This package augments standard Ada.Text_IO with facilities for input

--  and output of time values in standardized format.

package GNAT.Calendar.Time_IO is

   Picture_Error : exception;

   --  Exception raised for incorrect picture

   type Picture_String is new String;

   --  This is a string to describe date and time output format. The string is

   --  a set of standard character and special tag that are replaced by the

   --  corresponding values. It follows the GNU Date specification. Here are

   --  the recognized directives :

   --

   --          %    a literal %

   --          n    a newline

   --          t    a horizontal tab

   --

   --          Time fields:

   --

   --          %H   hour (00..23)

   --          %I   hour (01..12)

   --          %k   hour ( 0..23)

   --          %l   hour ( 1..12)

   --          %M   minute (00..59)

   --          %p   locale's AM or PM

   --          %r   time, 12-hour (hh:mm:ss [AP]M)

   --          %s   seconds  since 1970-01-01  00:00:00 UTC

   --                (a nonstandard extension)

   --          %S   second (00..59)

   --          %T   time, 24-hour (hh:mm:ss)

   --

   --          Date fields:

   --

   --          %a   locale's abbreviated weekday name (Sun..Sat)

   --          %A   locale's    full   weekday   name,    variable   length

   --                  (Sunday..Saturday)

   --          %b   locale's abbreviated month name (Jan..Dec)

   --          %B   locale's    full    month    name,   variable    length

   --                  (January..December)

   --          %c   locale's date and time (Sat Nov 04 12:02:33 EST 1989)

   --          %d   day of month (01..31)

   --          %D   date (mm/dd/yy)

   --          %h   same as %b

   --          %j   day of year (001..366)

   --          %m   month (01..12)

   --          %U   week number  of year with  Sunday as first day  of week

   --                  (00..53)

   --          %w   day of week (0..6) with 0 corresponding to Sunday

   --          %W   week number  of year with  Monday as first day  of week

   --                  (00..53)

   --          %x   locale's date representation (mm/dd/yy)

   --          %y   last two digits of year (00..99)

   --          %Y   year (1970...)

   --

   --          By default,  date pads numeric fields with zeroes.  GNU date

   --          recognizes the following nonstandard numeric modifiers:

   --

   --          -    (hyphen) do not pad the field

   --          _    (underscore) pad the field with spaces

   --

   --  Here are some GNAT extensions to the GNU Date specification:

   --

   --          %i   milliseconds (3 digits)

   --          %e   microseconds (6 digits)

   --          %o   nanoseconds  (9 digits)

   ISO_Date : constant Picture_String;

   --  This format follow the ISO 8601 standard. The format is "YYYY-MM-DD",

   --  four digits year, month and day number separated by minus.

   US_Date : constant Picture_String;

   --  This format is the common US date format: "MM/DD/YY",

   --  month and day number, two digits year separated by slashes.

   European_Date : constant Picture_String;

   --  This format is the common European date format: "DD/MM/YY",

   --  day and month number, two digits year separated by slashes.

   function Image

     (Date    : Ada.Calendar.Time;

      Picture : Picture_String) return String;

   --  Return Date as a string with format Picture. Raise Picture_Error if

   --  picture string is null or has an incorrect format.

   function Value (Date : String) return Ada.Calendar.Time;

   --  Parse the string Date and return its equivalent as a Time value. The

   --  following time format is supported:

   --

   --     hh:mm:ss             - Date is the current date

   --

   --  The following formats are also supported. They all accept an optional

   --  time with the format "hh:mm:ss". The time is separated from the date by

   --  exactly one space character.

   --

   --  When the time is not specified, it is set to 00:00:00. The delimiter '*'

   --  must be either '-' and '/' and both occurrences must use the same

   --  character.

   --

   --  Trailing characters (in particular spaces) are not allowed

   --

   --     yyyy*mm*dd           - ISO format

   --     yy*mm*dd             - Year is assumed to be 20yy

   --     mm*dd*yyyy           - (US date format)

   --     dd*mmm*yyyy          - month spelled out

   --     yyyy*mmm*dd          - month spelled out

   --     yyyymmdd             - Iso format, no separator

   --     mmm dd, yyyy         - month spelled out

   --     dd mmm yyyy          - month spelled out

   --

   --  Constraint_Error is raised if the input string is malformed (does not

   --  conform to one of the above dates, or has an invalid time string), or

   --  the resulting time is not valid.

   procedure Put_Time (Date : Ada.Calendar.Time; Picture : Picture_String);

   --  Put Date with format Picture. Raise Picture_Error if bad picture string

private

   ISO_Date      : constant Picture_String := "%Y-%m-%d";

   US_Date       : constant Picture_String := "%m/%d/%y";

   European_Date : constant Picture_String := "%d/%m/%y";

end GNAT.Calendar.Time_IO;