------------------------------------------------------------------------------
--                                                                          --
--                         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                                  --
--                                                                          --
--                            $Revision: 1.3 $
--                                                                          --
--              Copyright (C) 1999 Ada Core Technologies, 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- --
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-- 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 --
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-- MA 02111-1307, 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. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
--                                                                          --
------------------------------------------------------------------------------

--  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;

   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


   ISO_Date      : constant Picture_String;
   US_Date       : constant Picture_String;
   European_Date : constant Picture_String;

   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 wrong

   procedure Put_Time
     (Date    : Ada.Calendar.Time;
      Picture : Picture_String);
   --  Put Date with format Picture.
   --  raise Picture_Error if picture string is wrong

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;
