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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta name="robots" content="noindex,noarchive">
<title>Qt Toolkit - QDateTime Class</title><style type="text/css"><!--
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<h1 align=center>QDateTime Class Reference</h1><br clear="all">
<p>
The QDateTime class combines <a href="qdate.html">QDate</a> and <a href="qtime.html">QTime</a> into a single class.
<a href="#details">More...</a>
<p>
<code>#include <<a href="qdatetime-h.html">qdatetime.h</a>></code>
<p><a href="qdatetime-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><span class="fn"><a href="qdatetime.html#a0"><strong>QDateTime</strong></a>()</span>
<li><span class="fn"><a href="qdatetime.html#a1"><strong>QDateTime</strong></a>(constQDate&)</span>
<li><span class="fn"><a href="qdatetime.html#a2"><strong>QDateTime</strong></a>(constQDate&, constQTime&)</span>
<li><span class="fn">bool<a href="qdatetime.html#a3"><strong>isNull</strong></a>()const</span>
<li><span class="fn">bool<a href="qdatetime.html#a4"><strong>isValid</strong></a>()const</span>
<li><span class="fn">QDate<a href="qdatetime.html#a5"><strong>date</strong></a>()const</span>
<li><span class="fn">QTime<a href="qdatetime.html#a6"><strong>time</strong></a>()const</span>
<li><span class="fn">void<a href="qdatetime.html#a7"><strong>setDate</strong></a>(constQDate&date)</span>
<li><span class="fn">void<a href="qdatetime.html#a8"><strong>setTime</strong></a>(constQTime&time)</span>
<li><span class="fn">void<a href="qdatetime.html#a9"><strong>setTime_t</strong></a>(uintsecsSince1Jan1970UTC)</span>
<li><span class="fn">QString<a href="qdatetime.html#b0"><strong>toString</strong></a>()const</span>
<li><span class="fn">QDateTime<a href="qdatetime.html#b1"><strong>addDays</strong></a>(intdays)const</span>
<li><span class="fn">QDateTime<a href="qdatetime.html#b2"><strong>addSecs</strong></a>(intsecs)const</span>
<li><span class="fn">int<a href="qdatetime.html#b3"><strong>daysTo</strong></a>(constQDateTime&)const</span>
<li><span class="fn">int<a href="qdatetime.html#b4"><strong>secsTo</strong></a>(constQDateTime&)const</span>
<li><span class="fn">bool<a href="qdatetime.html#b5"><strong>operator==</strong></a>(constQDateTime&dt)const</span>
<li><span class="fn">bool<a href="qdatetime.html#b6"><strong>operator!=</strong></a>(constQDateTime&dt)const</span>
<li><span class="fn">bool<a href="qdatetime.html#b7"><strong>operator<</strong></a>(constQDateTime&dt)const</span>
<li><span class="fn">bool<a href="qdatetime.html#b8"><strong>operator<=</strong></a>(constQDateTime&dt)const</span>
<li><span class="fn">bool<a href="qdatetime.html#b9"><strong>operator></strong></a>(constQDateTime&dt)const</span>
<li><span class="fn">bool<a href="qdatetime.html#c0"><strong>operator>=</strong></a>(constQDateTime&dt)const</span>
</ul>
<h2>Static Public Members</h2>
<ul>
<li><span class="fn">QDateTime<a href="qdatetime.html#c4"><strong>currentDateTime</strong></a>()</span>
</ul>
<h2>Related Functions</h2>
(Note that these are not member functions.)
<ul>
<li>QDataStream & <a href="qdatetime.html#c5"><strong>operator<<</strong></a> (QDataStream & s, const QDateTime & dt)
<li>QDataStream & <a href="qdatetime.html#c6"><strong>operator>></strong></a> (QDataStream & s, QDateTime & dt)
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
The QDateTime class combines <a href="qdate.html">QDate</a> and <a href="qtime.html">QTime</a> into a single class.
<p>
QDateTime provides high precision date and time functions since it can work
with Gregorian dates up to about year 8000.
<p>Most countries that use the Gregorian calendar switched to it between 1550
and 1920.
<p>See also: <a href="qdate.html">QDate</a> and <a href="qtime.html">QTime</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="a0"></a>QDateTime::QDateTime()</h3>
<p>Constructs a null datetime (i.e. null date and null time). A null
datetime is invalid, since the date is invalid.
<h3 class="fn"><a name="a1"></a>QDateTime::QDateTime(const<a href="qdate.html">QDate</a>&date)</h3>
<p>Constructs a datetime with date <em>date</em> and null time (00:00:00.000).
<h3 class="fn"><a name="a2"></a>QDateTime::QDateTime(const<a href="qdate.html">QDate</a>&date, const<a href="qtime.html">QTime</a>&time)</h3>
<p>Constructs a datetime with date <em>date</em> and time <em>time.</em>
<h3 class="fn">QDateTime<a name="b1"></a>QDateTime::addDays(intndays)const</h3>
<p>Returns the datetime plus <em>ndays</em> days.
<p>See also: <a href="qdatetime.html#b3">daysTo</a>().
<h3 class="fn">QDateTime<a name="b2"></a>QDateTime::addSecs(intnsecs)const</h3>
<p>Returns the datetime plus <em>nsecs</em> seconds.
<p>See also: <a href="qdatetime.html#b4">secsTo</a>().
<h3 class="fn">QDateTime<a name="c4"></a>QDateTime::currentDateTime() <code>[static]</code></h3>
<p>Returns the current datetime.
<p>See also: <a href="qdate.html#d0">QDate::currentDate</a>() and <a href="qtime.html#c8">QTime::currentTime</a>().
<h3 class="fn"><a href="qdate.html">QDate</a><a name="a5"></a>QDateTime::date()const</h3>
<p>Returns the date part of this datetime.
<p>See also: <a href="qdatetime.html#a6">time</a>().
<h3 class="fn">int<a name="b3"></a>QDateTime::daysTo(constQDateTime&dt)const</h3>
<p>Returns the number of days from this datetime to <em>dt,</em> which is
negative if <em>dt</em> is in the past.
<p>See also: <a href="qdatetime.html#b1">addDays</a>() and <a href="qdatetime.html#b4">secsTo</a>().
<h3 class="fn">bool<a name="a3"></a>QDateTime::isNull()const</h3>
<p>Returns TRUE if both the date and the time are null. A null date is invalid.
<p>See also: <a href="qdate.html#a2">QDate::isNull</a>() and <a href="qtime.html#a2">QTime::isNull</a>().
<h3 class="fn">bool<a name="a4"></a>QDateTime::isValid()const</h3>
<p>Returns TRUE if both the date and the time are value.
<p>See also: <a href="qdate.html#a3">QDate::isValid</a>() and <a href="qtime.html#a3">QTime::isValid</a>().
<h3 class="fn">bool<a name="b6"></a>QDateTime::operator!=(constQDateTime&dt)const</h3>
<p>Returns TRUE if this datetime is different from <em>dt,</em> or FALSE if
they are equal.
<p>See also: <a href="qdatetime.html#b5">operator==</a>().
<h3 class="fn">bool<a name="b7"></a>QDateTime::operator<(constQDateTime&dt)const</h3>
<p>Returns TRUE if this datetime is before <em>dt,</em> otherwise FALSE.
<h3 class="fn">bool<a name="b8"></a>QDateTime::operator<=(constQDateTime&dt)const</h3>
<p>Returns TRUE if this datetime is before or equal to <em>dt,</em> otherwise
FALSE.
<h3 class="fn">bool<a name="b5"></a>QDateTime::operator==(constQDateTime&dt)const</h3>
<p>Returns TRUE if this datetime is equal to <em>dt,</em> or FALSE if
they are different.
<p>See also: <a href="qdatetime.html#b6">operator!=</a>().
<h3 class="fn">bool<a name="b9"></a>QDateTime::operator>(constQDateTime&dt)const</h3>
<p>Returns TRUE if this datetime is after <em>dt,</em> otherwise FALSE.
<h3 class="fn">bool<a name="c0"></a>QDateTime::operator>=(constQDateTime&dt)const</h3>
<p>Returns TRUE if this datetime is equal to or after <em>dt,</em> otherwise
FALSE.
<h3 class="fn">int<a name="b4"></a>QDateTime::secsTo(constQDateTime&dt)const</h3>
<p>Returns the number of seconds from this datetime to <em>dt,</em> which is
negative if <em>t</em> is in the past.
<p>Example:
<pre> <a href="qdatetime.html">QDateTime</a> dt = QDateTime::currentDateTime();
<a href="qdatetime.html">QDateTime</a> x( <a href="qdate.html">QDate</a>(dt.year(),12,24), QTime(17,00) );
<a href="qapplication.html#j4">debug</a>( "There are %d seconds to Christmas", dt.<a href="qdatetime.html#b4">secsTo</a>(x) );
</pre>
<p>See also: <a href="qdatetime.html#b2">addSecs</a>(), <a href="qdatetime.html#b3">daysTo</a>() and <a href="qtime.html#b1">QTime::secsTo</a>().
<h3 class="fn">void<a name="a7"></a>QDateTime::setDate(const<a href="qdate.html">QDate</a>&date)</h3>
<p>Sets the date part of this datetime.
<p>See also: <a href="qdatetime.html#a8">setTime</a>().
<h3 class="fn">void<a name="a8"></a>QDateTime::setTime(const<a href="qtime.html">QTime</a>&time)</h3>
<p>Sets the time part of this datetime.
<p>See also: <a href="qdatetime.html#a7">setDate</a>().
<h3 class="fn">void<a name="a9"></a>QDateTime::setTime_t(uintsecsSince1Jan1970UTC)</h3>
<p>Sets the local date and time given the number of seconds that have passed
since 00:00:00 on January 1, 1970, Coordinated Universal Time (UTC).
On systems that do not support timezones this function will behave as if
local time were UTC.
<h3 class="fn"><a href="qtime.html">QTime</a><a name="a6"></a>QDateTime::time()const</h3>
<p>Returns the time part of this datetime.
<p>See also: <a href="qdatetime.html#a5">date</a>().
<h3 class="fn"><a href="qstring.html">QString</a><a name="b0"></a>QDateTime::toString()const</h3>
<p>Returns the datetime as a string.
<p>The string format is "Sat May 20 1995 03:40:13".
<hr><h2>Related Functions</h2>
<h3><a href="qdatastream.html">QDataStream</a> & <a name="c5"></a>operator<< (<a href="qdatastream.html">QDataStream</a> & s, const QDateTime & dt)</h3>
<p>Writes a datetime to the stream.
<p>Serialization format: [<a href="qdate.html">QDate</a> <a href="qtime.html">QTime</a>].
<h3><a href="qdatastream.html">QDataStream</a> & <a name="c6"></a>operator>> (<a href="qdatastream.html">QDataStream</a> & s, QDateTime & dt)</h3>
<p>Reads a datetime from the stream.
<hr><p>
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It was generated from the following files:
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<li>qdatetime.h: 1998/08/25
<li>qdatetime.cpp: 1999/02/15
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