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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;
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