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author | Timothy Pearson <[email protected]> | 2011-07-10 15:24:15 -0500 |
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committer | Timothy Pearson <[email protected]> | 2011-07-10 15:24:15 -0500 |
commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/y2k.doc | |
download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip |
Add Qt3 development HEAD version
Diffstat (limited to 'doc/y2k.doc')
-rw-r--r-- | doc/y2k.doc | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/doc/y2k.doc b/doc/y2k.doc new file mode 100644 index 0000000..77f155b --- /dev/null +++ b/doc/y2k.doc @@ -0,0 +1,90 @@ +/**************************************************************************** +** +** Qt Year 2000 Compliance +** +** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. +** +** This file is part of the Qt 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 Qt 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 [email protected]. +** +** 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 Qt and the +implementation of Qt are both Year 2000 Compliant, and that the use of +underlying APIs by Qt does not have any known problems. + +\section1 The API Provided by Qt + +Several parts of Qt deal with dates and times: +\list +\i \l QDate - provides date management +\i \l QDateTime - provides date/time management +\i \l QTime - provides time management (within a date) +\i \l QTimer - provides delayed or regular execution of code. +\endlist + +All of these classes' external APIs are Year 2000 Compliant: QDate and +QDateTime offer only four-digit years as output, QTime and QTimer do +not deal with years or leap days at all. + +\section1 Implementation Issues in Qt + +All date/time calculation and storage in Qt uses number of days, +seconds or milliseconds, and is thus Year 2000 Compliant. + +This applies to the above four classes and also to \l QFileDialog +(which can sort files by time/date), \l QFileInfo (which operates on +file times/dates) and \l QApplication (which does various internal +housekeeping tasks). + +The conversion to <tt>year/month/date</tt> format in QDate (and +QDateTime) 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 Qt runs are +Year 2000 Compliant. However, Qt does not use any APIs that are known +to have any Year 2000-related bugs, or seem at risk to have any. +*/ |