From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, T_FILL_THIS_FORM_SHORT autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,34e6505a3616fb21 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2001-03-17 02:20:07 PST Path: supernews.google.com!sn-xit-03!supernews.com!freenix!wanadoo.fr!not-for-mail From: Pascal Obry Newsgroups: comp.lang.ada Subject: Re: calander package - Proposal for dates Date: 17 Mar 2001 11:16:20 +0100 Organization: Home - http://perso.wanadoo.fr/pascal.obry Message-ID: References: <3AB2D1EF.B2CA8117@acm.org> NNTP-Posting-Host: mix-velizy-107-2-41.abo.wanadoo.fr X-Trace: wanadoo.fr 984823580 14161 193.249.45.41 (17 Mar 2001 10:06:20 GMT) X-Complaints-To: abuse@wanadoo.fr NNTP-Posting-Date: 17 Mar 2001 10:06:20 GMT X-Newsreader: Gnus v5.7/Emacs 20.7 Xref: supernews.google.com comp.lang.ada:5796 Date: 2001-03-17T10:06:20+00:00 List-Id: Jeffrey Carter writes: > This proposal limits you to a fixed set of formats. If the format you > need is not in that set, you are out of luck. Indeed. Please have a look at the GNAT.Calendar.Time_IO package which is very flexible. Well let me post the spec of GNAT.Calendar and GNAT.Calendar.Time_IO. These are certainly a good start for this discussion :) << ------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- G N A T . C A L E N D A R -- -- -- -- S p e c -- -- -- -- $Revision: 1.4 $ -- -- -- Copyright (C) 1999-2000 Free Software Foundation, Inc. -- -- -- -- 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, 59 Temple Place - Suite 330, Boston, -- -- 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 extends Ada.Calendar to handle Hour, Minute, Second, -- Second_Duration and Day_Of_Week and Day_In_Year from Calendar.Time. -- Second_Duration precision depends on the target clock precision. -- -- GNAT.Calendar provides the same kind of abstraction found in -- Ada.Calendar. It provides Split and Time_Of to build and split a Time -- data. And it provides accessor functions to get only one of Hour, Minute, -- Second, Second_Duration. Other functions are to access more advanced -- valueas like Day_Of_Week, Day_In_Year and Week_In_Year. with Ada.Calendar; with Interfaces.C; package GNAT.Calendar is type Day_Name is (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday); subtype Hour_Number is Natural range 0 .. 23; subtype Minute_Number is Natural range 0 .. 59; subtype Second_Number is Natural range 0 .. 59; subtype Second_Duration is Ada.Calendar.Day_Duration range 0.0 .. 1.0; subtype Day_In_Year_Number is Positive range 1 .. 366; subtype Week_In_Year_Number is Positive range 1 .. 53; function Hour (Date : Ada.Calendar.Time) return Hour_Number; function Minute (Date : Ada.Calendar.Time) return Minute_Number; function Second (Date : Ada.Calendar.Time) return Second_Number; function Sub_Second (Date : Ada.Calendar.Time) return Second_Duration; -- Hour, Minute, Sedond and Sub_Second returns the complete time data for -- the Date (H:M:S.SS). See Ada.Calendar for Year, Month, Day accessors. -- Second_Duration precision depends on the target clock precision. function Day_Of_Week (Date : Ada.Calendar.Time) return Day_Name; -- Return the day name. function Day_In_Year (Date : Ada.Calendar.Time) return Day_In_Year_Number; -- Returns the day number in the year. (1st January is day 1 and 31st -- December is day 365 or 366 for leap year). function Week_In_Year (Date : Ada.Calendar.Time) return Week_In_Year_Number; -- Returns the week number in the year with Monday as first day of week procedure Split (Date : Ada.Calendar.Time; Year : out Ada.Calendar.Year_Number; Month : out Ada.Calendar.Month_Number; Day : out Ada.Calendar.Day_Number; Hour : out Hour_Number; Minute : out Minute_Number; Second : out Second_Number; Sub_Second : out Second_Duration); -- Split the standard Ada.Calendar.Time data in date data (Year, Month, -- Day) and Time data (Hour, Minute, Second, Sub_Second) function Time_Of (Year : Ada.Calendar.Year_Number; Month : Ada.Calendar.Month_Number; Day : Ada.Calendar.Day_Number; Hour : Hour_Number; Minute : Minute_Number; Second : Second_Number; Sub_Second : Second_Duration := 0.0) return Ada.Calendar.Time; -- Returns an Ada.Calendar.Time data built from the date and time values. -- C timeval conversion -- C timeval represent a duration (used in Select for example). This -- structure is composed of a number of seconds and a number of micro -- seconds. The timeval structure is not exposed here because its -- definition is target dependent. Interface to C programs is done via a -- pointer to timeval structure. type timeval is private; function To_Duration (T : access timeval) return Duration; function To_Timeval (D : Duration) return timeval; private -- This is a dummy declaration that should be the largest possible timeval -- structure of all supported targets. type timeval is array (1 .. 2) of Interfaces.C.long; function Julian_Day (Year : Ada.Calendar.Year_Number; Month : Ada.Calendar.Month_Number; Day : Ada.Calendar.Day_Number) return Integer; -- Compute Julian day number. -- -- The code of this function is a modified version of algorithm -- 199 from the Collected Algorithms of the ACM. -- The author of algorithm 199 is Robert G. Tantzen. end GNAT.Calendar; >> << ------------------------------------------------------------------------------ -- -- -- 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- -- -- 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, 59 Temple Place - Suite 330, Boston, -- -- 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; >> Pascal. -- --|------------------------------------------------------ --| Pascal Obry Team-Ada Member --| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE --|------------------------------------------------------ --| http://perso.wanadoo.fr/pascal.obry --| --| "The best way to travel is by means of imagination"