You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
3.7 KiB
91 lines
3.7 KiB
/****************************************************************************
|
|
**
|
|
** TQt Year 2000 Compliance
|
|
**
|
|
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
|
|
**
|
|
** This file is part of the TQt GUI Toolkit.
|
|
**
|
|
** This file may be used under the terms of the GNU General
|
|
** Public License versions 2.0 or 3.0 as published by the Free
|
|
** Software Foundation and appearing in the files LICENSE.GPL2
|
|
** and LICENSE.GPL3 included in the packaging of this file.
|
|
** Alternatively you may (at your option) use any later version
|
|
** of the GNU General Public License if such license has been
|
|
** publicly approved by Trolltech ASA (or its successors, if any)
|
|
** and the KDE Free TQt Foundation.
|
|
**
|
|
** Please review the following information to ensure GNU General
|
|
** Public Licensing requirements will be met:
|
|
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
|
|
** If you are unsure which license is appropriate for your use, please
|
|
** review the following information:
|
|
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
|
|
** or contact the sales department at sales@trolltech.com.
|
|
**
|
|
** This file may be used under the terms of the Q Public License as
|
|
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
|
|
** included in the packaging of this file. Licensees holding valid Qt
|
|
** Commercial licenses may use this file in accordance with the Qt
|
|
** Commercial License Agreement provided with the Software.
|
|
**
|
|
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
|
|
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
|
|
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
|
|
** herein.
|
|
**
|
|
**********************************************************************/
|
|
|
|
/*! \page y2k.html
|
|
|
|
\title Year 2000 Compliance Statement
|
|
|
|
Trolltech defines <i>Year 2000 Compliance</i> as a requirement that a
|
|
product or part of product does not contain errors related to
|
|
transition from December 31, 1999 to January 1, 2000, or to the
|
|
existence of February 29, 2000.
|
|
|
|
This document certifies that the API provided by TQt and the
|
|
implementation of TQt are both Year 2000 Compliant, and that the use of
|
|
underlying APIs by TQt does not have any known problems.
|
|
|
|
\section1 The API Provided by Qt
|
|
|
|
Several parts of TQt deal with dates and times:
|
|
\list
|
|
\i \l TQDate - provides date management
|
|
\i \l TQDateTime - provides date/time management
|
|
\i \l TQTime - provides time management (within a date)
|
|
\i \l TQTimer - provides delayed or regular execution of code.
|
|
\endlist
|
|
|
|
All of these classes' external APIs are Year 2000 Compliant: TQDate and
|
|
TQDateTime offer only four-digit years as output, TQTime and TQTimer do
|
|
not deal with years or leap days at all.
|
|
|
|
\section1 Implementation Issues in Qt
|
|
|
|
All date/time calculation and storage in TQt uses number of days,
|
|
seconds or milliseconds, and is thus Year 2000 Compliant.
|
|
|
|
This applies to the above four classes and also to \l TQFileDialog
|
|
(which can sort files by time/date), \l TQFileInfo (which operates on
|
|
file times/dates) and \l TQApplication (which does various internal
|
|
housekeeping tasks).
|
|
|
|
The conversion to <tt>year/month/date</tt> format in TQDate (and
|
|
TQDateTime) has been verified to be correct for all of December 31,
|
|
1999, January 1, 2000, February 28 and 29, 2000, March 1, 2000,
|
|
January 1, 2001 and March 1, 2001.
|
|
|
|
Qt has been verified to be robust in case of time/date errors (such as
|
|
time warps) in the underlying operating system.
|
|
|
|
\section1 Use of System APIs
|
|
|
|
It is of course impossible for Trolltech to ensure that both of the
|
|
window systems and all of the operating systems on which TQt runs are
|
|
Year 2000 Compliant. However, TQt does not use any APIs that are known
|
|
to have any Year 2000-related bugs, or seem at risk to have any.
|
|
*/
|