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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>QTime Class Reference</h1>
<p>The QTime class provides clock time functions.
<a href="#details">More...</a>
<p>All the functions in this class are <a href="threads.html#reentrant">reentrant</a> when Qt is built with thread support.</p>
<p><tt>#include &lt;<a href="qdatetime-h.html">qdatetime.h</a>&gt;</tt>
<p><a href="qtime-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#QTime"><b>QTime</b></a> ()</li>
<li class=fn><a href="#QTime-2"><b>QTime</b></a> ( int&nbsp;h, int&nbsp;m, int&nbsp;s = 0, int&nbsp;ms = 0 )</li>
<li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li>
<li class=fn>bool <a href="#isValid"><b>isValid</b></a> () const</li>
<li class=fn>int <a href="#hour"><b>hour</b></a> () const</li>
<li class=fn>int <a href="#minute"><b>minute</b></a> () const</li>
<li class=fn>int <a href="#second"><b>second</b></a> () const</li>
<li class=fn>int <a href="#msec"><b>msec</b></a> () const</li>
<li class=fn>QString <a href="#toString-2"><b>toString</b></a> ( Qt::DateFormat&nbsp;f = Qt::TextDate ) const</li>
<li class=fn>QString <a href="#toString"><b>toString</b></a> ( const&nbsp;QString&nbsp;&amp;&nbsp;format ) const</li>
<li class=fn>bool <a href="#setHMS"><b>setHMS</b></a> ( int&nbsp;h, int&nbsp;m, int&nbsp;s, int&nbsp;ms = 0 )</li>
<li class=fn>QTime <a href="#addSecs"><b>addSecs</b></a> ( int&nbsp;nsecs ) const</li>
<li class=fn>int <a href="#secsTo"><b>secsTo</b></a> ( const&nbsp;QTime&nbsp;&amp;&nbsp;t ) const</li>
<li class=fn>QTime <a href="#addMSecs"><b>addMSecs</b></a> ( int&nbsp;ms ) const</li>
<li class=fn>int <a href="#msecsTo"><b>msecsTo</b></a> ( const&nbsp;QTime&nbsp;&amp;&nbsp;t ) const</li>
<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const&nbsp;QTime&nbsp;&amp;&nbsp;t ) const</li>
<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const&nbsp;QTime&nbsp;&amp;&nbsp;t ) const</li>
<li class=fn>bool <a href="#operator-lt"><b>operator&lt;</b></a> ( const&nbsp;QTime&nbsp;&amp;&nbsp;t ) const</li>
<li class=fn>bool <a href="#operator-lt-eq"><b>operator&lt;=</b></a> ( const&nbsp;QTime&nbsp;&amp;&nbsp;t ) const</li>
<li class=fn>bool <a href="#operator-gt"><b>operator&gt;</b></a> ( const&nbsp;QTime&nbsp;&amp;&nbsp;t ) const</li>
<li class=fn>bool <a href="#operator-gt-eq"><b>operator&gt;=</b></a> ( const&nbsp;QTime&nbsp;&amp;&nbsp;t ) const</li>
<li class=fn>void <a href="#start"><b>start</b></a> ()</li>
<li class=fn>int <a href="#restart"><b>restart</b></a> ()</li>
<li class=fn>int <a href="#elapsed"><b>elapsed</b></a> () const</li>
</ul>
<h2>Static Public Members</h2>
<ul>
<li class=fn>QTime <a href="#currentTime-2"><b>currentTime</b></a> ()</li>
<li class=fn>QTime <a href="#currentTime"><b>currentTime</b></a> ( Qt::TimeSpec&nbsp;ts )</li>
<li class=fn>QTime <a href="#fromString"><b>fromString</b></a> ( const&nbsp;QString&nbsp;&amp;&nbsp;s, Qt::DateFormat&nbsp;f = Qt::TextDate )</li>
<li class=fn>bool <a href="#isValid-2"><b>isValid</b></a> ( int&nbsp;h, int&nbsp;m, int&nbsp;s, int&nbsp;ms = 0 )</li>
</ul>
<h2>Related Functions</h2>
<ul>
<li class=fn>QDataStream &amp; <a href="#operator-lt-lt"><b>operator&lt;&lt;</b></a> ( QDataStream&nbsp;&amp;&nbsp;s, const&nbsp;QTime&nbsp;&amp;&nbsp;t )</li>
<li class=fn>QDataStream &amp; <a href="#operator-gt-gt"><b>operator&gt;&gt;</b></a> ( QDataStream&nbsp;&amp;&nbsp;s, QTime&nbsp;&amp;&nbsp;t )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
<p> The QTime class provides clock time functions.
<p>
<p> A QTime object contains a clock time, i.e. the number of hours,
minutes, seconds, and milliseconds since midnight. It can read the
current time from the system clock and measure a span of elapsed
time. It provides functions for comparing times and for
manipulating a time by adding a number of (milli)seconds.
<p> QTime uses the 24-hour clock format; it has no concept of AM/PM.
It operates in local time; it knows nothing about time zones or
daylight savings time.
<p> A QTime object is typically created either by giving the number of
hours, minutes, seconds, and milliseconds explicitly, or by using
the static function <a href="#currentTime">currentTime</a>(), which creates a QTime object
that contains the system's clock time. Note that the accuracy
depends on the accuracy of the underlying operating system; not
all systems provide 1-millisecond accuracy.
<p> The <a href="#hour">hour</a>(), <a href="#minute">minute</a>(), <a href="#second">second</a>(), and <a href="#msec">msec</a>() functions provide
access to the number of hours, minutes, seconds, and milliseconds
of the time. The same information is provided in textual format by
the <a href="#toString">toString</a>() function.
<p> QTime provides a full set of operators to compare two QTime
objects. One time is considered smaller than another if it is
earlier than the other.
<p> The time a given number of seconds or milliseconds later than a
given time can be found using the <a href="#addSecs">addSecs</a>() or <a href="#addMSecs">addMSecs</a>()
functions. Correspondingly, the number of (milli)seconds between
two times can be found using the <a href="#secsTo">secsTo</a>() or <a href="#msecsTo">msecsTo</a>() functions.
<p> QTime can be used to measure a span of elapsed time using the
<a href="#start">start</a>(), <a href="#restart">restart</a>(), and <a href="#elapsed">elapsed</a>() functions.
<p> <p>See also <a href="qdate.html">QDate</a>, <a href="qdatetime.html">QDateTime</a>, and <a href="time.html">Time and Date</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QTime"></a>QTime::QTime ()
</h3>
<p> Constructs the time 0 hours, minutes, seconds and milliseconds,
i.e. 00:00:00.000 (midnight). This is a valid time.
<p> <p>See also <a href="#isValid">isValid</a>().
<h3 class=fn><a name="QTime-2"></a>QTime::QTime ( int&nbsp;h, int&nbsp;m, int&nbsp;s = 0, int&nbsp;ms = 0 )
</h3>
Constructs a time with hour <em>h</em>, minute <em>m</em>, seconds <em>s</em> and
milliseconds <em>ms</em>.
<p> <em>h</em> must be in the range 0..23, <em>m</em> and <em>s</em> must be in the
range 0..59, and <em>ms</em> must be in the range 0..999.
<p> <p>See also <a href="#isValid">isValid</a>().
<h3 class=fn><a href="qtime.html">QTime</a> <a name="addMSecs"></a>QTime::addMSecs ( int&nbsp;ms ) const
</h3>
Returns a QTime object containing a time <em>ms</em> milliseconds later
than the time of this object (or earlier if <em>ms</em> is negative).
<p> Note that the time will wrap if it passes midnight. See <a href="#addSecs">addSecs</a>()
for an example.
<p> <p>See also <a href="#addSecs">addSecs</a>() and <a href="#msecsTo">msecsTo</a>().
<h3 class=fn><a href="qtime.html">QTime</a> <a name="addSecs"></a>QTime::addSecs ( int&nbsp;nsecs ) const
</h3>
Returns a QTime object containing a time <em>nsecs</em> seconds later
than the time of this object (or earlier if <em>nsecs</em> is negative).
<p> Note that the time will wrap if it passes midnight.
<p> Example:
<pre>
QTime n( 14, 0, 0 ); // n == 14:00:00
QTime t;
t = n.<a href="#addSecs">addSecs</a>( 70 ); // t == 14:01:10
t = n.<a href="#addSecs">addSecs</a>( -70 ); // t == 13:58:50
t = n.<a href="#addSecs">addSecs</a>( 10*60*60 + 5 ); // t == 00:00:05
t = n.<a href="#addSecs">addSecs</a>( -15*60*60 ); // t == 23:00:00
</pre>
<p> <p>See also <a href="#addMSecs">addMSecs</a>(), <a href="#secsTo">secsTo</a>(), and <a href="qdatetime.html#addSecs">QDateTime::addSecs</a>().
<h3 class=fn><a href="qtime.html">QTime</a> <a name="currentTime"></a>QTime::currentTime ( <a href="qt.html#TimeSpec-enum">Qt::TimeSpec</a>&nbsp;ts )<tt> [static]</tt>
</h3>
Returns the current time as reported by the system clock, for the
TimeSpec <em>ts</em>. The default TimeSpec is LocalTime.
<p> Note that the accuracy depends on the accuracy of the underlying
operating system; not all systems provide 1-millisecond accuracy.
<p> <p>See also <a href="qt.html#TimeSpec-enum">Qt::TimeSpec</a>.
<p>Examples: <a href="aclock-example.html#x1201">aclock/aclock.cpp</a>, <a href="dclock-example.html#x1104">dclock/dclock.cpp</a>, <a href="tutorial1-12.html#x2398">t12/cannon.cpp</a>, and <a href="tictac-example.html#x40">tictac/tictac.cpp</a>.
<h3 class=fn><a href="qtime.html">QTime</a> <a name="currentTime-2"></a>QTime::currentTime ()<tt> [static]</tt>
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns the current time as reported by the system clock.
<p> Note that the accuracy depends on the accuracy of the underlying
operating system; not all systems provide 1-millisecond accuracy.
<h3 class=fn>int <a name="elapsed"></a>QTime::elapsed () const
</h3>
Returns the number of milliseconds that have elapsed since the
last time <a href="#start">start</a>() or <a href="#restart">restart</a>() was called.
<p> Note that the counter wraps to zero 24 hours after the last call
to start() or restart.
<p> Note that the accuracy depends on the accuracy of the underlying
operating system; not all systems provide 1-millisecond accuracy.
<p> <b>Warning:</b> If the system's clock setting has been changed since the
last time start() or restart() was called, the result is
undefined. This can happen when daylight savings time is turned on
or off.
<p> <p>See also <a href="#start">start</a>() and <a href="#restart">restart</a>().
<h3 class=fn><a href="qtime.html">QTime</a> <a name="fromString"></a>QTime::fromString ( const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;s, <a href="qt.html#DateFormat-enum">Qt::DateFormat</a>&nbsp;f = Qt::TextDate )<tt> [static]</tt>
</h3>
Returns the representation <em>s</em> as a QTime using the format <em>f</em>,
or an invalid time if this is not possible.
<p> <b>Warning:</b> Note that <a href="qt.html#DateFormat-enum">Qt::LocalDate</a> cannot be used here.
<h3 class=fn>int <a name="hour"></a>QTime::hour () const
</h3>
Returns the hour part (0..23) of the time.
<p>Examples: <a href="aclock-example.html#x1202">aclock/aclock.cpp</a> and <a href="tictac-example.html#x41">tictac/tictac.cpp</a>.
<h3 class=fn>bool <a name="isNull"></a>QTime::isNull () const
</h3>
<p> Returns TRUE if the time is equal to 00:00:00.000; otherwise
returns FALSE. A null time is valid.
<p> <p>See also <a href="#isValid">isValid</a>().
<h3 class=fn>bool <a name="isValid"></a>QTime::isValid () const
</h3>
Returns TRUE if the time is valid; otherwise returns FALSE. The
time 23:30:55.746 is valid, whereas 24:12:30 is invalid.
<p> <p>See also <a href="#isNull">isNull</a>().
<h3 class=fn>bool <a name="isValid-2"></a>QTime::isValid ( int&nbsp;h, int&nbsp;m, int&nbsp;s, int&nbsp;ms = 0 )<tt> [static]</tt>
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns TRUE if the specified time is valid; otherwise returns
FALSE.
<p> The time is valid if <em>h</em> is in the range 0..23, <em>m</em> and <em>s</em> are
in the range 0..59, and <em>ms</em> is in the range 0..999.
<p> Example:
<pre>
QTime::<a href="#isValid">isValid</a>(21, 10, 30); // returns TRUE
QTime::<a href="#isValid">isValid</a>(22, 5, 62); // returns FALSE
</pre>
<h3 class=fn>int <a name="minute"></a>QTime::minute () const
</h3>
Returns the minute part (0..59) of the time.
<p>Examples: <a href="aclock-example.html#x1203">aclock/aclock.cpp</a> and <a href="tictac-example.html#x42">tictac/tictac.cpp</a>.
<h3 class=fn>int <a name="msec"></a>QTime::msec () const
</h3>
Returns the millisecond part (0..999) of the time.
<h3 class=fn>int <a name="msecsTo"></a>QTime::msecsTo ( const&nbsp;<a href="qtime.html">QTime</a>&nbsp;&amp;&nbsp;t ) const
</h3>
Returns the number of milliseconds from this time to <em>t</em> (which
is negative if <em>t</em> is earlier than this time).
<p> Because QTime measures time within a day and there are 86400
seconds in a day, the result is always between -86400000 and
86400000 msec.
<p> <p>See also <a href="#secsTo">secsTo</a>().
<h3 class=fn>bool <a name="operator!-eq"></a>QTime::operator!= ( const&nbsp;<a href="qtime.html">QTime</a>&nbsp;&amp;&nbsp;t ) const
</h3>
<p> Returns TRUE if this time is different from <em>t</em>; otherwise returns FALSE.
<h3 class=fn>bool <a name="operator-lt"></a>QTime::operator&lt; ( const&nbsp;<a href="qtime.html">QTime</a>&nbsp;&amp;&nbsp;t ) const
</h3>
<p> Returns TRUE if this time is earlier than <em>t</em>; otherwise returns FALSE.
<h3 class=fn>bool <a name="operator-lt-eq"></a>QTime::operator&lt;= ( const&nbsp;<a href="qtime.html">QTime</a>&nbsp;&amp;&nbsp;t ) const
</h3>
<p> Returns TRUE if this time is earlier than or equal to <em>t</em>;
otherwise returns FALSE.
<h3 class=fn>bool <a name="operator-eq-eq"></a>QTime::operator== ( const&nbsp;<a href="qtime.html">QTime</a>&nbsp;&amp;&nbsp;t ) const
</h3>
<p> Returns TRUE if this time is equal to <em>t</em>; otherwise returns FALSE.
<h3 class=fn>bool <a name="operator-gt"></a>QTime::operator&gt; ( const&nbsp;<a href="qtime.html">QTime</a>&nbsp;&amp;&nbsp;t ) const
</h3>
<p> Returns TRUE if this time is later than <em>t</em>; otherwise returns FALSE.
<h3 class=fn>bool <a name="operator-gt-eq"></a>QTime::operator&gt;= ( const&nbsp;<a href="qtime.html">QTime</a>&nbsp;&amp;&nbsp;t ) const
</h3>
<p> Returns TRUE if this time is later than or equal to <em>t</em>;
otherwise returns FALSE.
<h3 class=fn>int <a name="restart"></a>QTime::restart ()
</h3>
Sets this time to the current time and returns the number of
milliseconds that have elapsed since the last time <a href="#start">start</a>() or
<a href="#restart">restart</a>() was called.
<p> This function is guaranteed to be atomic and is thus very handy
for repeated measurements. Call start() to start the first
measurement and then restart() for each later measurement.
<p> Note that the counter wraps to zero 24 hours after the last call
to start() or restart().
<p> <b>Warning:</b> If the system's clock setting has been changed since the
last time start() or restart() was called, the result is
undefined. This can happen when daylight savings time is turned on
or off.
<p> <p>See also <a href="#start">start</a>(), <a href="#elapsed">elapsed</a>(), and <a href="#currentTime">currentTime</a>().
<h3 class=fn>int <a name="second"></a>QTime::second () const
</h3>
Returns the second part (0..59) of the time.
<p>Example: <a href="tictac-example.html#x43">tictac/tictac.cpp</a>.
<h3 class=fn>int <a name="secsTo"></a>QTime::secsTo ( const&nbsp;<a href="qtime.html">QTime</a>&nbsp;&amp;&nbsp;t ) const
</h3>
Returns the number of seconds from this time to <em>t</em> (which is
negative if <em>t</em> is earlier than this time).
<p> Because QTime measures time within a day and there are 86400
seconds in a day, the result is always between -86400 and 86400.
<p> <p>See also <a href="#addSecs">addSecs</a>() and <a href="qdatetime.html#secsTo">QDateTime::secsTo</a>().
<p>Example: <a href="tutorial1-12.html#x2399">t12/cannon.cpp</a>.
<h3 class=fn>bool <a name="setHMS"></a>QTime::setHMS ( int&nbsp;h, int&nbsp;m, int&nbsp;s, int&nbsp;ms = 0 )
</h3>
Sets the time to hour <em>h</em>, minute <em>m</em>, seconds <em>s</em> and
milliseconds <em>ms</em>.
<p> <em>h</em> must be in the range 0..23, <em>m</em> and <em>s</em> must be in the
range 0..59, and <em>ms</em> must be in the range 0..999. Returns TRUE
if the set time is valid; otherwise returns FALSE.
<p> <p>See also <a href="#isValid">isValid</a>().
<h3 class=fn>void <a name="start"></a>QTime::start ()
</h3>
Sets this time to the current time. This is practical for timing:
<p> <pre>
QTime t;
t.<a href="#start">start</a>();
some_lengthy_task();
<a href="qapplication.html#qDebug">qDebug</a>( "Time elapsed: %d ms", t.<a href="#elapsed">elapsed</a>() );
</pre>
<p> <p>See also <a href="#restart">restart</a>(), <a href="#elapsed">elapsed</a>(), and <a href="#currentTime">currentTime</a>().
<h3 class=fn><a href="qstring.html">QString</a> <a name="toString"></a>QTime::toString ( const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;format ) const
</h3>
Returns the time as a string. The <em>format</em> parameter determines
the format of the result string.
<p> These expressions may be used:
<p> <center><table cellpadding="4" cellspacing="2" border="0">
<tr bgcolor="#a2c511"> <th valign="top">Expression <th valign="top">Output
<tr bgcolor="#f0f0f0"> <td valign="top">h
<td valign="top">the hour without a leading zero (0..23 or 1..12 if AM/PM display)
<tr bgcolor="#d0d0d0"> <td valign="top">hh
<td valign="top">the hour with a leading zero (00..23 or 01..12 if AM/PM display)
<tr bgcolor="#f0f0f0"> <td valign="top">m <td valign="top">the minute without a leading zero (0..59)
<tr bgcolor="#d0d0d0"> <td valign="top">mm <td valign="top">the minute with a leading zero (00..59)
<tr bgcolor="#f0f0f0"> <td valign="top">s <td valign="top">the second whithout a leading zero (0..59)
<tr bgcolor="#d0d0d0"> <td valign="top">ss <td valign="top">the second whith a leading zero (00..59)
<tr bgcolor="#f0f0f0"> <td valign="top">z <td valign="top">the milliseconds without leading zeroes (0..999)
<tr bgcolor="#d0d0d0"> <td valign="top">zzz <td valign="top">the milliseconds with leading zeroes (000..999)
<tr bgcolor="#f0f0f0"> <td valign="top">AP
<td valign="top">use AM/PM display. <em>AP</em> will be replaced by either "AM" or "PM".
<tr bgcolor="#d0d0d0"> <td valign="top">ap
<td valign="top">use am/pm display. <em>ap</em> will be replaced by either "am" or "pm".
</table></center>
<p> All other input characters will be ignored.
<p> Example format strings (assuming that the QTime is 14:13:09.042)
<p> <center><table cellpadding="4" cellspacing="2" border="0">
<tr bgcolor="#a2c511"> <th valign="top">Format <th valign="top">Result
<tr bgcolor="#f0f0f0"> <td valign="top">hh:mm:ss.zzz <td valign="top" colspan="1" rowspan="1"> 14:13:09.042
<tr bgcolor="#d0d0d0"> <td valign="top">h:m:s ap <td valign="top" colspan="1" rowspan="1"> 2:13:9 pm
</table></center>
<p> If the time is an invalid time, then <a href="qstring.html#QString-null">QString::null</a> will be returned.
<p> <p>See also <a href="qdate.html#toString">QDate::toString</a>() and <a href="qdatetime.html#toString">QDateTime::toString</a>().
<h3 class=fn><a href="qstring.html">QString</a> <a name="toString-2"></a>QTime::toString ( <a href="qt.html#DateFormat-enum">Qt::DateFormat</a>&nbsp;f = Qt::TextDate ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns the time as a string. Milliseconds are not included. The
<em>f</em> parameter determines the format of the string.
<p> If <em>f</em> is <a href="qt.html#DateFormat-enum">Qt::TextDate</a>, the string format is HH:MM:SS; e.g. 1
second before midnight would be "23:59:59".
<p> If <em>f</em> is <a href="qt.html#DateFormat-enum">Qt::ISODate</a>, the string format corresponds to the
ISO 8601 extended specification for representations of dates,
which is also HH:MM:SS.
<p> If <em>f</em> is Qt::LocalDate, the string format depends on the locale
settings of the system.
<p> If the time is an invalid time, then <a href="qstring.html#QString-null">QString::null</a> will be returned.
<hr><h2>Related Functions</h2>
<h3 class=fn><a href="qdatastream.html">QDataStream</a>&nbsp;&amp; <a name="operator-lt-lt"></a>operator&lt;&lt; ( <a href="qdatastream.html">QDataStream</a>&nbsp;&amp;&nbsp;s, const&nbsp;<a href="qtime.html">QTime</a>&nbsp;&amp;&nbsp;t )
</h3>
<p> Writes time <em>t</em> to the stream <em>s</em>.
<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
<h3 class=fn><a href="qdatastream.html">QDataStream</a>&nbsp;&amp; <a name="operator-gt-gt"></a>operator&gt;&gt; ( <a href="qdatastream.html">QDataStream</a>&nbsp;&amp;&nbsp;s, <a href="qtime.html">QTime</a>&nbsp;&amp;&nbsp;t )
</h3>
<p> Reads a time from the stream <em>s</em> into <em>t</em>.
<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
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