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