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authorTimothy Pearson <[email protected]>2011-07-10 15:24:15 -0500
committerTimothy Pearson <[email protected]>2011-07-10 15:24:15 -0500
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+/****************************************************************************
+**
+** 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.
+*/