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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>TQDate Class Reference</h1>
<p>The TQDate class provides date functions.
<a href="#details">More...</a>
<p>All the functions in this class are <a href="threads.html#reentrant">reentrant</a> when TQt is built with thread support.</p>
<p><tt>#include <<a href="qdatetime-h.html">ntqdatetime.h</a>></tt>
<p><a href="qdate-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#TQDate"><b>TQDate</b></a> ()</li>
<li class=fn><a href="#TQDate-2"><b>TQDate</b></a> ( int y, int m, int d )</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="#year"><b>year</b></a> () const</li>
<li class=fn>int <a href="#month"><b>month</b></a> () const</li>
<li class=fn>int <a href="#day"><b>day</b></a> () const</li>
<li class=fn>int <a href="#dayOfWeek"><b>dayOfWeek</b></a> () const</li>
<li class=fn>int <a href="#dayOfYear"><b>dayOfYear</b></a> () const</li>
<li class=fn>int <a href="#daysInMonth"><b>daysInMonth</b></a> () const</li>
<li class=fn>int <a href="#daysInYear"><b>daysInYear</b></a> () const</li>
<li class=fn>int <a href="#weekNumber"><b>weekNumber</b></a> ( int * yearNumber = 0 ) const</li>
<li class=fn>TQString <a href="#toString-2"><b>toString</b></a> ( TQt::DateFormat f = TQt::TextDate ) const</li>
<li class=fn>TQString <a href="#toString"><b>toString</b></a> ( const TQString & format ) const</li>
<li class=fn>bool <a href="#setYMD"><b>setYMD</b></a> ( int y, int m, int d )</li>
<li class=fn>TQDate <a href="#addDays"><b>addDays</b></a> ( int ndays ) const</li>
<li class=fn>TQDate <a href="#addMonths"><b>addMonths</b></a> ( int nmonths ) const</li>
<li class=fn>TQDate <a href="#addYears"><b>addYears</b></a> ( int nyears ) const</li>
<li class=fn>int <a href="#daysTo"><b>daysTo</b></a> ( const TQDate & d ) const</li>
<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const TQDate & d ) const</li>
<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const TQDate & d ) const</li>
<li class=fn>bool <a href="#operator-lt"><b>operator<</b></a> ( const TQDate & d ) const</li>
<li class=fn>bool <a href="#operator-lt-eq"><b>operator<=</b></a> ( const TQDate & d ) const</li>
<li class=fn>bool <a href="#operator-gt"><b>operator></b></a> ( const TQDate & d ) const</li>
<li class=fn>bool <a href="#operator-gt-eq"><b>operator>=</b></a> ( const TQDate & d ) const</li>
</ul>
<h2>Static Public Members</h2>
<ul>
<li class=fn>TQString monthName ( int month ) <em>(obsolete)</em></li>
<li class=fn>TQString dayName ( int weekday ) <em>(obsolete)</em></li>
<li class=fn>TQString <a href="#shortMonthName"><b>shortMonthName</b></a> ( int month )</li>
<li class=fn>TQString <a href="#shortDayName"><b>shortDayName</b></a> ( int weekday )</li>
<li class=fn>TQString <a href="#longMonthName"><b>longMonthName</b></a> ( int month )</li>
<li class=fn>TQString <a href="#longDayName"><b>longDayName</b></a> ( int weekday )</li>
<li class=fn>TQDate <a href="#currentDate-2"><b>currentDate</b></a> ()</li>
<li class=fn>TQDate <a href="#currentDate"><b>currentDate</b></a> ( TQt::TimeSpec ts )</li>
<li class=fn>TQDate <a href="#fromString"><b>fromString</b></a> ( const TQString & s, TQt::DateFormat f = TQt::TextDate )</li>
<li class=fn>bool <a href="#isValid-2"><b>isValid</b></a> ( int y, int m, int d )</li>
<li class=fn>bool <a href="#leapYear"><b>leapYear</b></a> ( int y )</li>
</ul>
<h2>Related Functions</h2>
<ul>
<li class=fn>TQDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( TQDataStream & s, const TQDate & d )</li>
<li class=fn>TQDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( TQDataStream & s, TQDate & d )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The TQDate class provides date functions.
<p>
<p> A TQDate object contains a calendar date, i.e. year, month, and day
numbers, in the modern Western (Gregorian) calendar. It can read
the current date from the system clock. It provides functions for
comparing dates and for manipulating dates, e.g. by adding a
number of days or months or years.
<p> A TQDate object is typically created either by giving the year,
month and day numbers explicitly, or by using the static function
<a href="#currentDate">currentDate</a>(), which creates a TQDate object containing the system
clock's date. An explicit date can also be set using <a href="#setYMD">setYMD</a>(). The
<a href="#fromString">fromString</a>() function returns a TQDate given a string and a date
format which is used to interpret the date within the string.
<p> The <a href="#year">year</a>(), <a href="#month">month</a>(), and <a href="#day">day</a>() functions provide access to the
year, month, and day numbers. Also, <a href="#dayOfWeek">dayOfWeek</a>() and <a href="#dayOfYear">dayOfYear</a>()
functions are provided. The same information is provided in
textual format by the <a href="#toString">toString</a>(), <a href="#shortDayName">shortDayName</a>(), <a href="#longDayName">longDayName</a>(),
<a href="#shortMonthName">shortMonthName</a>() and <a href="#longMonthName">longMonthName</a>() functions.
<p> TQDate provides a full set of operators to compare two TQDate
objects where smaller means earlier and larger means later.
<p> You can increment (or decrement) a date by a given number of days
using <a href="#addDays">addDays</a>(). Similarly you can use <a href="#addMonths">addMonths</a>() and <a href="#addYears">addYears</a>().
The <a href="#daysTo">daysTo</a>() function returns the number of days between two
dates.
<p> The <a href="#daysInMonth">daysInMonth</a>() and <a href="#daysInYear">daysInYear</a>() functions return how many days
there are in this date's month and year, respectively. The
<a href="#leapYear">leapYear</a>() function indicates whether this date is in a leap year.
<p> Note that TQDate should not be used for date calculations for dates
prior to the introduction of the Gregorian calendar. This calendar
was adopted by England from the 14<sup><small>th</small></sup>
September 1752 (hence this is the earliest valid TQDate), and
subsequently by most other Western countries, until 1923.
<p> The end of time is reached around the year 8000, by which time we
expect TQt to be obsolete.
<p> <p>See also <a href="qtime.html">TQTime</a>, <a href="ntqdatetime.html">TQDateTime</a>, <a href="qdateedit.html">TQDateEdit</a>, <a href="ntqdatetimeedit.html">TQDateTimeEdit</a>, and <a href="time.html">Time and Date</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="TQDate"></a>TQDate::TQDate ()
</h3>
<p> Constructs a null date. Null dates are invalid.
<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isValid">isValid</a>().
<h3 class=fn><a name="TQDate-2"></a>TQDate::TQDate ( int y, int m, int d )
</h3>
Constructs a date with year <em>y</em>, month <em>m</em> and day <em>d</em>.
<p> <em>y</em> must be in the range 1752..8000, <em>m</em> must be in the range
1..12, and <em>d</em> must be in the range 1..31.
<p> <b>Warning:</b> If <em>y</em> is in the range 0..99, it is interpreted as
1900..1999.
<p> <p>See also <a href="#isValid">isValid</a>().
<h3 class=fn><a href="qdate.html">TQDate</a> <a name="addDays"></a>TQDate::addDays ( int ndays ) const
</h3>
Returns a TQDate object containing a date <em>ndays</em> later than the
date of this object (or earlier if <em>ndays</em> is negative).
<p> <p>See also <a href="#addMonths">addMonths</a>(), <a href="#addYears">addYears</a>(), and <a href="#daysTo">daysTo</a>().
<h3 class=fn><a href="qdate.html">TQDate</a> <a name="addMonths"></a>TQDate::addMonths ( int nmonths ) const
</h3>
Returns a TQDate object containing a date <em>nmonths</em> later than the
date of this object (or earlier if <em>nmonths</em> is negative).
<p> <p>See also <a href="#addDays">addDays</a>() and <a href="#addYears">addYears</a>().
<h3 class=fn><a href="qdate.html">TQDate</a> <a name="addYears"></a>TQDate::addYears ( int nyears ) const
</h3>
Returns a TQDate object containing a date <em>nyears</em> later than the
date of this object (or earlier if <em>nyears</em> is negative).
<p> <p>See also <a href="#addDays">addDays</a>() and <a href="#addMonths">addMonths</a>().
<h3 class=fn><a href="qdate.html">TQDate</a> <a name="currentDate"></a>TQDate::currentDate ( <a href="ntqt.html#TimeSpec-enum">TQt::TimeSpec</a> ts )<tt> [static]</tt>
</h3>
Returns the current date, as reported by the system clock, for the
TimeSpec <em>ts</em>. The default TimeSpec is LocalTime.
<p> <p>See also <a href="qtime.html#currentTime">TQTime::currentTime</a>(), <a href="ntqdatetime.html#currentDateTime">TQDateTime::currentDateTime</a>(), and <a href="ntqt.html#TimeSpec-enum">TQt::TimeSpec</a>.
<p>Example: <a href="dclock-example.html#x1098">dclock/dclock.cpp</a>.
<h3 class=fn><a href="qdate.html">TQDate</a> <a name="currentDate-2"></a>TQDate::currentDate ()<tt> [static]</tt>
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns the current date, as reported by the system clock.
<p> <p>See also <a href="qtime.html#currentTime">TQTime::currentTime</a>() and <a href="ntqdatetime.html#currentDateTime">TQDateTime::currentDateTime</a>().
<h3 class=fn>int <a name="day"></a>TQDate::day () const
</h3>
Returns the day of the month (1..31) of this date.
<p> <p>See also <a href="#year">year</a>(), <a href="#month">month</a>(), and <a href="#dayOfWeek">dayOfWeek</a>().
<p>Example: <a href="dclock-example.html#x1099">dclock/dclock.cpp</a>.
<h3 class=fn><a href="tqstring.html">TQString</a> <a name="dayName"></a>TQDate::dayName ( int weekday )<tt> [static]</tt>
</h3>
<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
<p> Use <a href="#shortDayName">shortDayName</a>() instead.
<h3 class=fn>int <a name="dayOfWeek"></a>TQDate::dayOfWeek () const
</h3>
Returns the weekday (Monday=1..Sunday=7) for this date.
<p> <p>See also <a href="#day">day</a>() and <a href="#dayOfYear">dayOfYear</a>().
<h3 class=fn>int <a name="dayOfYear"></a>TQDate::dayOfYear () const
</h3>
Returns the day of the year (1..365) for this date.
<p> <p>See also <a href="#day">day</a>() and <a href="#dayOfWeek">dayOfWeek</a>().
<h3 class=fn>int <a name="daysInMonth"></a>TQDate::daysInMonth () const
</h3>
Returns the number of days in the month (28..31) for this date.
<p> <p>See also <a href="#day">day</a>() and <a href="#daysInYear">daysInYear</a>().
<h3 class=fn>int <a name="daysInYear"></a>TQDate::daysInYear () const
</h3>
Returns the number of days in the year (365 or 366) for this date.
<p> <p>See also <a href="#day">day</a>() and <a href="#daysInMonth">daysInMonth</a>().
<h3 class=fn>int <a name="daysTo"></a>TQDate::daysTo ( const <a href="qdate.html">TQDate</a> & d ) const
</h3>
Returns the number of days from this date to <em>d</em> (which is
negative if <em>d</em> is earlier than this date).
<p> Example:
<pre>
TQDate d1( 1995, 5, 17 ); // May 17th 1995
TQDate d2( 1995, 5, 20 ); // May 20th 1995
d1.<a href="#daysTo">daysTo</a>( d2 ); // returns 3
d2.<a href="#daysTo">daysTo</a>( d1 ); // returns -3
</pre>
<p> <p>See also <a href="#addDays">addDays</a>().
<h3 class=fn><a href="qdate.html">TQDate</a> <a name="fromString"></a>TQDate::fromString ( const <a href="tqstring.html">TQString</a> & s, <a href="ntqt.html#DateFormat-enum">TQt::DateFormat</a> f = TQt::TextDate )<tt> [static]</tt>
</h3>
Returns the TQDate represented by the string <em>s</em>, using the format
<em>f</em>, or an invalid date if the string cannot be parsed.
<p> Note for <a href="ntqt.html#DateFormat-enum">TQt::TextDate</a>: It is recommended that you use the
English short month names (e.g. "Jan"). Although localized month
names can also be used, they depend on the user's locale settings.
<p> <b>Warning:</b> <a href="ntqt.html#DateFormat-enum">TQt::LocalDate</a> cannot be used here.
<h3 class=fn>bool <a name="isNull"></a>TQDate::isNull () const
</h3>
<p> Returns TRUE if the date is null; otherwise returns FALSE. A null
date is invalid.
<p> <p>See also <a href="#isValid">isValid</a>().
<h3 class=fn>bool <a name="isValid"></a>TQDate::isValid () const
</h3>
Returns TRUE if this date is valid; otherwise returns FALSE.
<p> <p>See also <a href="#isNull">isNull</a>().
<h3 class=fn>bool <a name="isValid-2"></a>TQDate::isValid ( int y, int m, int d )<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 date (year <em>y</em>, month <em>m</em> and day
<em>d</em>) is valid; otherwise returns FALSE.
<p> Example:
<pre>
TQDate::<a href="#isValid">isValid</a>( 2002, 5, 17 ); // TRUE May 17th 2002 is valid
TQDate::<a href="#isValid">isValid</a>( 2002, 2, 30 ); // FALSE Feb 30th does not exist
TQDate::<a href="#isValid">isValid</a>( 2004, 2, 29 ); // TRUE 2004 is a leap year
TQDate::<a href="#isValid">isValid</a>( 1202, 6, 6 ); // FALSE 1202 is pre-Gregorian
</pre>
<p> <b>Warning:</b> A <em>y</em> value in the range 00..99 is interpreted as
1900..1999.
<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#setYMD">setYMD</a>().
<h3 class=fn>bool <a name="leapYear"></a>TQDate::leapYear ( int y )<tt> [static]</tt>
</h3>
Returns TRUE if the specified year <em>y</em> is a leap year; otherwise
returns FALSE.
<h3 class=fn><a href="tqstring.html">TQString</a> <a name="longDayName"></a>TQDate::longDayName ( int weekday )<tt> [static]</tt>
</h3>
Returns the long name of the <em>weekday</em>.
<p> 1 = "Monday", 2 = "Tuesday", ... 7 = "Sunday"
<p> The day names will be localized according to the system's locale
settings.
<p> <p>See also <a href="#toString">toString</a>(), <a href="#shortDayName">shortDayName</a>(), <a href="#shortMonthName">shortMonthName</a>(), and <a href="#longMonthName">longMonthName</a>().
<h3 class=fn><a href="tqstring.html">TQString</a> <a name="longMonthName"></a>TQDate::longMonthName ( int month )<tt> [static]</tt>
</h3>
Returns the long name of the <em>month</em>.
<p> 1 = "January", 2 = "February", ... 12 = "December"
<p> The month names will be localized according to the system's locale
settings.
<p> <p>See also <a href="#toString">toString</a>(), <a href="#shortMonthName">shortMonthName</a>(), <a href="#shortDayName">shortDayName</a>(), and <a href="#longDayName">longDayName</a>().
<h3 class=fn>int <a name="month"></a>TQDate::month () const
</h3>
Returns the month (January=1..December=12) of this date.
<p> <p>See also <a href="#year">year</a>() and <a href="#day">day</a>().
<p>Example: <a href="dclock-example.html#x1100">dclock/dclock.cpp</a>.
<h3 class=fn><a href="tqstring.html">TQString</a> <a name="monthName"></a>TQDate::monthName ( int month )<tt> [static]</tt>
</h3>
<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
<p> Use <a href="#shortMonthName">shortMonthName</a>() instead.
<h3 class=fn>bool <a name="operator!-eq"></a>TQDate::operator!= ( const <a href="qdate.html">TQDate</a> & d ) const
</h3>
<p> Returns TRUE if this date is different from <em>d</em>; otherwise returns FALSE.
<h3 class=fn>bool <a name="operator-lt"></a>TQDate::operator< ( const <a href="qdate.html">TQDate</a> & d ) const
</h3>
<p> Returns TRUE if this date is earlier than <em>d</em>, otherwise returns FALSE.
<h3 class=fn>bool <a name="operator-lt-eq"></a>TQDate::operator<= ( const <a href="qdate.html">TQDate</a> & d ) const
</h3>
<p> Returns TRUE if this date is earlier than or equal to <em>d</em>,
otherwise returns FALSE.
<h3 class=fn>bool <a name="operator-eq-eq"></a>TQDate::operator== ( const <a href="qdate.html">TQDate</a> & d ) const
</h3>
<p> Returns TRUE if this date is equal to <em>d</em>; otherwise returns FALSE.
<h3 class=fn>bool <a name="operator-gt"></a>TQDate::operator> ( const <a href="qdate.html">TQDate</a> & d ) const
</h3>
<p> Returns TRUE if this date is later than <em>d</em>, otherwise returns FALSE.
<h3 class=fn>bool <a name="operator-gt-eq"></a>TQDate::operator>= ( const <a href="qdate.html">TQDate</a> & d ) const
</h3>
<p> Returns TRUE if this date is later than or equal to <em>d</em>,
otherwise returns FALSE.
<h3 class=fn>bool <a name="setYMD"></a>TQDate::setYMD ( int y, int m, int d )
</h3>
Sets the date's year <em>y</em>, month <em>m</em> and day <em>d</em>.
<p> <em>y</em> must be in the range 1752..8000, <em>m</em> must be in the range
1..12, and <em>d</em> must be in the range 1..31.
<p> <b>Warning:</b> If <em>y</em> is in the range 0..99, it is interpreted as
1900..1999.
<p> Returns TRUE if the date is valid; otherwise returns FALSE.
<h3 class=fn><a href="tqstring.html">TQString</a> <a name="shortDayName"></a>TQDate::shortDayName ( int weekday )<tt> [static]</tt>
</h3>
Returns the name of the <em>weekday</em>.
<p> 1 = "Mon", 2 = "Tue", ... 7 = "Sun"
<p> The day names will be localized according to the system's locale
settings.
<p> <p>See also <a href="#toString">toString</a>(), <a href="#shortMonthName">shortMonthName</a>(), <a href="#longMonthName">longMonthName</a>(), and <a href="#longDayName">longDayName</a>().
<h3 class=fn><a href="tqstring.html">TQString</a> <a name="shortMonthName"></a>TQDate::shortMonthName ( int month )<tt> [static]</tt>
</h3>
Returns the name of the <em>month</em>.
<p> 1 = "Jan", 2 = "Feb", ... 12 = "Dec"
<p> The month names will be localized according to the system's locale
settings.
<p> <p>See also <a href="#toString">toString</a>(), <a href="#longMonthName">longMonthName</a>(), <a href="#shortDayName">shortDayName</a>(), and <a href="#longDayName">longDayName</a>().
<h3 class=fn><a href="tqstring.html">TQString</a> <a name="toString"></a>TQDate::toString ( const <a href="tqstring.html">TQString</a> & format ) const
</h3>
Returns the date 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">d <td valign="top">the day as number without a leading zero (1-31)
<tr bgcolor="#d0d0d0"> <td valign="top">dd <td valign="top">the day as number with a leading zero (01-31)
<tr bgcolor="#f0f0f0"> <td valign="top">ddd
<td valign="top">the abbreviated localized day name (e.g. 'Mon'..'Sun').
Uses <a href="#shortDayName">TQDate::shortDayName</a>().
<tr bgcolor="#d0d0d0"> <td valign="top">dddd
<td valign="top">the long localized day name (e.g. 'Monday'..'Sunday').
Uses <a href="#longDayName">TQDate::longDayName</a>().
<tr bgcolor="#f0f0f0"> <td valign="top">M <td valign="top">the month as number without a leading zero (1-12)
<tr bgcolor="#d0d0d0"> <td valign="top">MM <td valign="top">the month as number with a leading zero (01-12)
<tr bgcolor="#f0f0f0"> <td valign="top">MMM
<td valign="top">the abbreviated localized month name (e.g. 'Jan'..'Dec').
Uses <a href="#shortMonthName">TQDate::shortMonthName</a>().
<tr bgcolor="#d0d0d0"> <td valign="top">MMMM
<td valign="top">the long localized month name (e.g. 'January'..'December').
Uses <a href="#longMonthName">TQDate::longMonthName</a>().
<tr bgcolor="#f0f0f0"> <td valign="top">yy <td valign="top">the year as two digit number (00-99)
<tr bgcolor="#d0d0d0"> <td valign="top">yyyy <td valign="top">the year as four digit number (1752-8000)
</table></center>
<p> All other input characters will be ignored.
<p> Example format strings (assuming that the TQDate is the
20<sup><small>th</small></sup> July 1969):
<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">dd.MM.yyyy <td valign="top" colspan="1" rowspan="1"> 20.07.1969
<tr bgcolor="#d0d0d0"> <td valign="top">ddd MMMM d yy <td valign="top" colspan="1" rowspan="1"> Sun July 20 69
</table></center>
<p> If the date is an invalid date, then <a href="tqstring.html#TQString-null">TQString::null</a> will be returned.
<p> <p>See also <a href="ntqdatetime.html#toString">TQDateTime::toString</a>() and <a href="qtime.html#toString">TQTime::toString</a>().
<p>
<h3 class=fn><a href="tqstring.html">TQString</a> <a name="toString-2"></a>TQDate::toString ( <a href="ntqt.html#DateFormat-enum">TQt::DateFormat</a> f = TQt::TextDate ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns the date as a string. The <em>f</em> parameter determines the
format of the string.
<p> If <em>f</em> is <a href="ntqt.html#DateFormat-enum">TQt::TextDate</a>, the string format is "Sat May 20 1995"
(using the <a href="#shortDayName">shortDayName</a>() and <a href="#shortMonthName">shortMonthName</a>() functions to
generate the string, so the day and month names are locale
specific).
<p> If <em>f</em> is <a href="ntqt.html#DateFormat-enum">TQt::ISODate</a>, the string format corresponds to the
ISO 8601 specification for representations of dates, which is
YYYY-MM-DD where YYYY is the year, MM is the month of the year
(between 01 and 12), and DD is the day of the month between 01 and
31.
<p> If <em>f</em> is <a href="ntqt.html#DateFormat-enum">TQt::LocalDate</a>, the string format depends on the
locale settings of the system.
<p> If the date is an invalid date, then <a href="tqstring.html#TQString-null">TQString::null</a> will be returned.
<p> <p>See also <a href="#shortDayName">shortDayName</a>() and <a href="#shortMonthName">shortMonthName</a>().
<h3 class=fn>int <a name="weekNumber"></a>TQDate::weekNumber ( int * yearNumber = 0 ) const
</h3>
Returns the week number (1 to 53), and stores the year in <em>*yearNumber</em> unless <em>yearNumber</em> is null (the default).
<p> Returns 0 if the date is invalid.
<p> In accordance with ISO 8601, weeks start on Monday and the first
Thursday of a year is always in week 1 of that year. Most years
have 52 weeks, but some have 53.
<p> <em>*yearNumber</em> is not always the same as <a href="#year">year</a>(). For example, 1
January 2000 has week number 52 in the year 1999, and 31 December
2002 has week number 1 in the year 2003.
<p>
<p> Copyright (c) 1989 The Regents of the University of California.
All rights reserved.
<p> Redistribution and use in source and binary forms are permitted
provided that the above copyright notice and this paragraph are
duplicated in all such forms and that any documentation,
advertising materials, and other materials related to such
distribution and use acknowledge that the software was developed
by the University of California, Berkeley. The name of the
University may not be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
<p> <p>See also <a href="#isValid">isValid</a>().
<h3 class=fn>int <a name="year"></a>TQDate::year () const
</h3>
Returns the year (1752..8000) of this date.
<p> <p>See also <a href="#month">month</a>() and <a href="#day">day</a>().
<hr><h2>Related Functions</h2>
<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="ntqdatastream.html">TQDataStream</a> & s, const <a href="qdate.html">TQDate</a> & d )
</h3>
<p> Writes the date, <em>d</em>, to the data stream, <em>s</em>.
<p> <p>See also <a href="datastreamformat.html">Format of the TQDataStream operators</a>.
<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="ntqdatastream.html">TQDataStream</a> & s, <a href="qdate.html">TQDate</a> & d )
</h3>
<p> Reads a date from the stream <em>s</em> into <em>d</em>.
<p> <p>See also <a href="datastreamformat.html">Format of the TQDataStream operators</a>.
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