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83 lines
3.8 KiB
83 lines
3.8 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/y2k.doc:36 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Year 2000 Compliance Statement</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Annotated</font></a>
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</td>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Year 2000 Compliance Statement</h1>
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<p> 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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<p> 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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<p> <h2> The API Provided by Qt
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</h2>
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<a name="1"></a><p> Several parts of Qt deal with dates and times:
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<ul>
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<li> <a href="qdate.html">QDate</a> - provides date management
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<li> <a href="qdatetime.html">QDateTime</a> - provides date/time management
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<li> <a href="qtime.html">QTime</a> - provides time management (within a date)
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<li> <a href="qtimer.html">QTimer</a> - provides delayed or regular execution of code.
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</ul>
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<p> All of these classes' external APIs are Year 2000 Compliant: <a href="qdate.html">QDate</a> and
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<a href="qdatetime.html">QDateTime</a> offer only four-digit years as output, <a href="qtime.html">QTime</a> and <a href="qtimer.html">QTimer</a> do
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not deal with years or leap days at all.
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<p> <h2> Implementation Issues in Qt
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</h2>
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<a name="2"></a><p> 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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<p> This applies to the above four classes and also to <a href="qfiledialog.html">QFileDialog</a>
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(which can sort files by time/date), <a href="qfileinfo.html">QFileInfo</a> (which operates on
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file times/dates) and <a href="qapplication.html">QApplication</a> (which does various internal
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housekeeping tasks).
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<p> 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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<p> 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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<p> <h2> Use of System APIs
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</h2>
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<a name="3"></a><p> 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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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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