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+/****************************************************************************
+** 
+**
+** Implementation of date and time classes
+**
+** Created : 940124
+**
+** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
+**
+** This file is part of the tools module of the Qt GUI Toolkit.
+**
+** This file may be distributed under the terms of the Q Public License
+** as defined by Trolltech AS of Norway and appearing in the file
+** LICENSE.QPL included in the packaging of this file.
+**
+** This file may be distributed and/or modified under the terms of the
+** GNU General Public License version 2 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.
+**
+** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
+** 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
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
+**   information about Qt Commercial License Agreements.
+** See http://www.trolltech.com/qpl/ for QPL licensing information.
+** See http://www.trolltech.com/gpl/ for GPL licensing information.
+**
+** Contact info@trolltech.com if any conditions of this licensing are
+** not clear to you.
+**
+**********************************************************************/
+
+#define gettimeofday	__hide_gettimeofday
+#include "qdatetime.h"
+#include "qdatastream.h"
+#include <stdio.h>
+#include <time.h>
+#if defined(_OS_WIN32_)
+#if defined(_CC_BOOL_DEF_)
+#undef	bool
+#include <windows.h>
+#define bool int
+#else
+#include <windows.h>
+#endif
+#elif defined(_OS_MSDOS_)
+#include <dos.h>
+#elif defined(_OS_OS2_)
+#include <os2.h>
+#elif defined(_OS_UNIX_)
+#include <sys/time.h>
+#include <unistd.h>
+#undef	gettimeofday
+extern "C" int gettimeofday( struct timeval *, struct timezone * );
+#endif
+
+static const uint FIRST_DAY	= 2361222;	// Julian day for 1752/09/14
+static const int  FIRST_YEAR	= 1752;		// ### wrong for many countries
+static const uint SECS_PER_DAY	= 86400;
+static const uint MSECS_PER_DAY = 86400000;
+static const uint SECS_PER_HOUR = 3600;
+static const uint MSECS_PER_HOUR= 3600000;
+static const uint SECS_PER_MIN	= 60;
+static const uint MSECS_PER_MIN = 60000;
+
+static const short monthDays[] ={0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+// ##### Localize.
+
+const char * const QDate::monthNames[] = {
+    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
+
+const char * const QDate::weekdayNames[] ={
+    "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
+
+
+/*****************************************************************************
+  QDate member functions
+ *****************************************************************************/
+
+// REVISED: aavit
+
+/*!
+  \class QDate qdatetime.h
+  \brief The QDate class provides date functions.
+
+  \ingroup time
+
+  A QDate 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 a date by adding a number of
+  days.
+
+  A QDate object is typically created either by giving the year, month
+  and day numbers explicitly, or by using the static function
+  currentDate(), which makes a QDate object which contains the
+  system's clock date. An explicit date can also be set using
+  setYMD().
+
+  The year(), month(), and day() functions provide access to the year,
+  month, and day numbers. Also, dayOfWeek() and dayOfYear() functions
+  are provided. The same information is provided in textual format by
+  the toString(), dayName(), and monthName() functions.
+
+  QDate provides a full set of operators to compare two QDate
+  objects. A date is considered smaller than another if it is earlier
+  than the other.
+
+  The date a given number of days later than a given date can be found
+  using the addDays() function. Correspondingly, the number of days
+  between two dates can be found using the daysTo() function.
+
+  The daysInMonth() and daysInYear() functions tell how many days
+  there are in this date's month and year, respectively. The
+  isLeapYear() function tells whether this date is in a leap year.
+
+  Note that QDate may not be used for date calculations for dates in
+  the remote past, i.e. prior to the introduction of the Gregorian
+  calendar. This calendar was adopted by England Sep. 14. 1752 (hence
+  this is the earliest valid QDate), and subsequently by most other
+  western countries, until 1923.
+
+  The end of time is reached around 8000AD, by which time we expect Qt
+  to be obsolete.
+
+  \sa QTime, QDateTime
+*/
+
+
+/*!
+  \fn QDate::QDate()
+  Constructs a null date. Null dates are invalid.
+
+  \sa isNull(), isValid()
+*/
+
+
+/*!
+  Constructs a date with the year \a y, month \a m and day \a d.
+
+  \a y must be in the range 1752-ca. 8000, \a m must be in the range
+  1-12, and \a d must be in the range 1-31. Exception: if \a y is in
+  the range 0-99, it is interpreted as 1900-1999.
+
+  \sa isValid()
+*/
+
+QDate::QDate( int y, int m, int d )
+{
+    jd = 0;
+    setYMD( y, m, d );
+}
+
+
+/*!
+  \fn bool QDate::isNull() const
+
+  Returns TRUE if the date is null.  A null date is invalid.
+
+  \sa isValid()
+*/
+
+
+/*!
+  Returns TRUE if this date is valid.
+
+  \sa isNull()
+*/
+
+bool QDate::isValid() const
+{
+    return jd >= FIRST_DAY;
+}
+
+
+/*!
+  Returns the year (>= 1752) of this date.
+
+  \sa month(), day()
+*/
+
+int QDate::year() const
+{
+    int y, m, d;
+    jul2greg( jd, y, m, d );
+    return y;
+}
+
+/*!
+  Returns the month (January=1 .. December=12) of this date.
+
+  \sa year(), day()
+*/
+
+int QDate::month() const
+{
+    int y, m, d;
+    jul2greg( jd, y, m, d );
+    return m;
+}
+
+/*!
+  Returns the day of the month (1..31) of this date.
+
+  \sa year(), month(), dayOfWeek()
+*/
+
+int QDate::day() const
+{
+    int y, m, d;
+    jul2greg( jd, y, m, d );
+    return d;
+}
+
+/*!
+  Returns the weekday (Monday=1 .. Sunday=7) for this date.
+
+  \sa day(), dayOfYear()
+*/
+
+int QDate::dayOfWeek() const
+{
+    return (((jd+1) % 7) + 6)%7 + 1;
+}
+
+/*!
+  Returns the day of the year (1..365) for this date.
+
+  \sa day(), dayOfWeek()
+*/
+
+int QDate::dayOfYear() const
+{
+    return jd - greg2jul(year(), 1, 1) + 1;
+}
+
+/*!
+  Returns the number of days in the month (28..31) for this date.
+
+  \sa day(), daysInYear()
+*/
+
+int QDate::daysInMonth() const
+{
+    int y, m, d;
+    jul2greg( jd, y, m, d );
+    if ( m == 2 && leapYear(y) )
+	return 29;
+    else
+	return monthDays[m];
+}
+
+/*!
+  Returns the number of days in the year (365 or 366) for this date.
+
+  \sa day(), daysInMonth()
+*/
+
+int QDate::daysInYear() const
+{
+    int y, m, d;
+    jul2greg( jd, y, m, d );
+    return leapYear(y) ? 366 : 365;
+}
+
+
+/*!
+  Returns the name of the \a month.
+
+  Month 1 == "Jan", month 2 == "Feb" etc.
+
+  \sa toString(), dayName()
+*/
+
+QString QDate::monthName( int month ) const
+{
+#if defined(CHECK_RANGE)
+    if ( month < 1 || month > 12 ) {
+	qWarning( "QDate::monthName: Parameter out ouf range." );
+	month = 1;
+    }
+#endif
+    // ### Remove the fromLatin1 during localization
+    return QString::fromLatin1(monthNames[month-1]);
+}
+
+/*!
+  Returns the name of the \a weekday.
+
+  Weekday 1 == "Mon", day 2 == "Tue" etc.
+
+  \sa toString(), monthName()
+*/
+
+QString QDate::dayName( int weekday ) const
+{
+#if defined(CHECK_RANGE)
+    if ( weekday < 1 || weekday > 7 ) {
+	qWarning( "QDate::dayName: Parameter out of range." );
+	weekday = 1;
+    }
+#endif
+    // ### Remove the fromLatin1 during localization
+    return QString::fromLatin1(weekdayNames[weekday-1]);
+}
+
+
+/*!
+  Returns the date as a string.
+
+  The string format is "Sat May 20 1995". This function uses the
+  dayName() and monthName() functions to generate the string.
+
+  \sa dayName(), monthName()
+*/
+
+QString QDate::toString() const
+{
+    int y, m, d;
+    jul2greg( jd, y, m, d );
+    QString buf = dayName(dayOfWeek());
+    buf += ' ';
+    buf += monthName(m);
+    QString t;
+    t.sprintf( " %d %d", d, y);
+    buf += t;
+    return buf;
+}
+
+
+/*!
+  Sets the year \a y, month \a m and day \a d.
+
+  \a y must be in the range 1752-ca. 8000, \a m must be in the range
+  1-12, and \a d must be in the range 1-31. Exception: if \a y is in
+  the range 0-99, it is interpreted as 1900-1999.
+
+  Returns TRUE if the date is valid, otherwise FALSE.
+*/
+
+bool QDate::setYMD( int y, int m, int d )
+{
+    if ( !isValid(y,m,d) ) {
+#if defined(CHECK_RANGE)
+	 qWarning( "QDate::setYMD: Invalid date %04d/%02d/%02d", y, m, d );
+#endif
+	 return FALSE;
+    }
+    jd = greg2jul( y, m, d );
+#if defined(DEBUG)
+    ASSERT( year() == y && month() == m && day() == d );
+#endif
+    return TRUE;
+}
+
+/*!
+  Returns a QDate object containing a date \a ndays later than the
+  date of this object (or earlier if \a ndays is negative).
+
+  \sa daysTo()
+*/
+
+QDate QDate::addDays( int ndays ) const
+{
+    QDate d;
+    d.jd = jd + ndays;
+    return d;
+}
+
+/*!
+  Returns the number of days from this date to \a d (which is negative
+  if \a d is earlier than this date).
+
+  Example:
+  \code
+    QDate d1( 1995, 5, 17 );		// May 17th 1995
+    QDate d2( 1995, 5, 20 );		// May 20th 1995
+    d1.daysTo( d2 );			// returns 3
+    d2.daysTo( d1 );			// returns -3
+  \endcode
+
+  \sa addDays()
+*/
+
+int QDate::daysTo( const QDate &d ) const
+{
+    return d.jd - jd;
+}
+
+
+/*!
+  \fn bool QDate::operator==( const QDate &d ) const
+  Returns TRUE if this date is equal to \a d, or FALSE if
+  they are different.
+*/
+
+/*!
+  \fn bool QDate::operator!=( const QDate &d ) const
+  Returns TRUE if this date is different from \a d, or FALSE if
+  they are equal.
+*/
+
+/*!
+  \fn bool QDate::operator<( const QDate &d ) const
+  Returns TRUE if this date is earlier than \a d, otherwise FALSE.
+*/
+
+/*!
+  \fn bool QDate::operator<=( const QDate &d ) const
+  Returns TRUE if this date is earlier than or equal to \a d, otherwise FALSE.
+*/
+
+/*!
+  \fn bool QDate::operator>( const QDate &d ) const
+  Returns TRUE if this date is later than \a d, otherwise FALSE.
+*/
+
+/*!
+  \fn bool QDate::operator>=( const QDate &d ) const
+  Returns TRUE if this date is later than or equal to \a d, otherwise FALSE.
+*/
+
+
+/*!
+  Returns the current date, as reported by the system clock.
+
+  \sa QTime::currentTime(), QDateTime::currentDateTime()
+*/
+
+QDate QDate::currentDate()
+{
+#if defined(_OS_WIN32_)
+
+    SYSTEMTIME t;
+    GetLocalTime( &t );
+    QDate d;
+    d.jd = greg2jul( t.wYear, t.wMonth, t.wDay );
+    return d;
+
+#else
+
+    time_t ltime;
+    time( &ltime );
+    tm *t = localtime( &ltime );
+    QDate d;
+    d.jd = greg2jul( t->tm_year + 1900, t->tm_mon + 1, t->tm_mday );
+    return d;
+
+#endif
+}
+
+/*!
+  Returns TRUE if the specified date (year \a y, month \a m and day \a
+  d) is valid.
+
+  Example:
+  \code
+    QDate::isValid( 2002, 5, 17 );	// TRUE;  May 17th 2002 is OK.
+    QDate::isValid( 2002, 2, 30 );	// FALSE; Feb 30th does not exist
+    QDate::isValid( 2004, 2, 29 );	// TRUE; 2004 is a leap year
+    QDate::isValid( 1202, 6, 6 );	// FALSE; 1202 is pre-Gregorian
+  \endcode
+
+  Note that a \a y value in the range 00-99 is interpreted as
+  1900-1999.
+
+  \sa isNull(), setYMD()
+*/
+
+bool QDate::isValid( int y, int m, int d )
+{
+    if ( y >= 0 && y <= 99 )
+	y += 1900;
+    else if ( y < FIRST_YEAR || (y == FIRST_YEAR && (m < 9 ||
+						    (m == 9 && d < 14))) )
+	return FALSE;
+    return (d > 0 && m > 0 && m <= 12) &&
+	   (d <= monthDays[m] || (d == 29 && m == 2 && leapYear(y)));
+}
+
+/*!
+  Returns TRUE if the specified year \a y is a leap year.
+*/
+
+bool QDate::leapYear( int y )
+{
+    return y % 4 == 0 && y % 100 != 0 || y % 400 == 0;
+}
+
+/*!
+  \internal
+  Converts a Gregorian date to a Julian day.
+  This algorithm is taken from Communications of the ACM, Vol 6, No 8.
+  \sa jul2greg()
+*/
+
+uint QDate::greg2jul( int y, int m, int d )
+{
+    uint c, ya;
+    if ( y <= 99 )
+	y += 1900;
+    if ( m > 2 ) {
+	m -= 3;
+    } else {
+	m += 9;
+	y--;
+    }
+    c = y;					// NOTE: Sym C++ 6.0 bug
+    c /= 100;
+    ya = y - 100*c;
+    return 1721119 + d + (146097*c)/4 + (1461*ya)/4 + (153*m+2)/5;
+}
+
+/*!
+  \internal
+  Converts a Julian day to a Gregorian date.
+  This algorithm is taken from Communications of the ACM, Vol 6, No 8.
+  \sa greg2jul()
+*/
+
+void QDate::jul2greg( uint jd, int &y, int &m, int &d )
+{
+    uint x;
+    uint j = jd - 1721119;
+    y = (j*4 - 1)/146097;
+    j = j*4 - 146097*y - 1;
+    x = j/4;
+    j = (x*4 + 3) / 1461;
+    y = 100*y + j;
+    x = (x*4) + 3 - 1461*j;
+    x = (x + 4)/4;
+    m = (5*x - 3)/153;
+    x = 5*x - 3 - 153*m;
+    d = (x + 5)/5;
+    if ( m < 10 ) {
+	m += 3;
+    } else {
+	m -= 9;
+	y++;
+    }
+}
+
+
+/*****************************************************************************
+  QTime member functions
+ *****************************************************************************/
+
+/*!
+  \class QTime qdatetime.h
+
+  \brief The QTime class provides clock time functions.
+
+  \ingroup time
+
+  A QTime object contains a clock time, i.e. a 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.
+
+  QTime operates with 24-hour clock format; it has no concept of
+  AM/PM. It operates with local time; it does not know anything about
+  time zones or daylight savings time.
+
+  A QTime object is typically created either by giving the number of
+  hours, minutes, seconds, and milliseconds explicitly, or by using
+  the static function currentTime(), which makes a QTime object which
+  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.
+
+  The hour(), minute(), second(), and msec() 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
+  toString() function.
+
+  QTime provides a full set of operators to compare two QTime
+  objects. A time is considered smaller than another if it is earlier
+  than the other.
+
+  The time a given number of seconds or milliseconds later than a
+  given time can be found using the addSecs() or addMSecs()
+  functions. Correspondingly, the number of (milli)seconds between two
+  times can be found using the secsTo() or msecsTo() functions.
+
+  QTime can be used to measure a span of elapsed time using the
+  start(), restart(), and elapsed() functions.
+
+  \sa QDate, QDateTime
+*/
+
+/*!
+  \fn QTime::QTime()
+
+  Constructs the time 0 hours, minutes, seconds and milliseconds,
+  i.e. 00:00:00.000 (midnight). This is a valid time.
+
+  \sa isValid()
+*/
+
+/*!
+  Constructs a time with hour \a h, minute \a m, seconds \a s and
+  milliseconds \a ms.
+
+  \a h must be in the range 0-23, \a m and \a s must be in the range
+  0-59, and \a ms must be in the range 0-999.
+
+  \sa isValid()
+*/
+
+QTime::QTime( int h, int m, int s, int ms )
+{
+    setHMS( h, m, s, ms );
+}
+
+
+/*!
+  \fn bool QTime::isNull() const
+  Returns TRUE if the time is equal to 00:00:00.000. A null time is valid.
+
+  \sa isValid()
+*/
+
+/*!
+  Returns TRUE if the time is valid, or FALSE if the time is invalid.
+  The time 23:30:55.746 is valid, while 24:12:30 is invalid.
+
+  \sa isNull()
+*/
+
+bool QTime::isValid() const
+{
+    return ds < MSECS_PER_DAY;
+}
+
+
+/*!
+  Returns the hour part (0..23) of the time.
+*/
+
+int QTime::hour() const
+{
+    return ds / MSECS_PER_HOUR;
+}
+
+/*!
+  Returns the minute part (0..59) of the time.
+*/
+
+int QTime::minute() const
+{
+    return (ds % MSECS_PER_HOUR)/MSECS_PER_MIN;
+}
+
+/*!
+  Returns the second part (0..59) of the time.
+*/
+
+int QTime::second() const
+{
+    return (ds / 1000)%SECS_PER_MIN;
+}
+
+/*!
+  Returns the millisecond part (0..999) of the time.
+*/
+
+int QTime::msec() const
+{
+    return ds % 1000;
+}
+
+
+/*!
+  Returns the time of this object in a textual format. Milliseconds
+  are not included. The string format is HH:MM:SS, e.g. 1 second
+  before midnight would be "23:59:59".
+*/
+
+QString QTime::toString() const
+{
+    QString buf;
+    buf.sprintf( "%.2d:%.2d:%.2d", hour(), minute(), second() );
+    return buf;
+}
+
+
+/*!
+  Sets the time to hour \a h, minute \a m, seconds \a s and
+  milliseconds \a ms.
+
+  \a h must be in the range 0-23, \a m and \a s must be in the range
+  0-59, and \a ms must be in the range 0-999. Returns TRUE if the set
+  time is valid, otherwise FALSE.
+
+  \sa isValid()
+*/
+
+bool QTime::setHMS( int h, int m, int s, int ms )
+{
+    if ( !isValid(h,m,s,ms) ) {
+#if defined(CHECK_RANGE)
+	qWarning( "QTime::setHMS Invalid time %02d:%02d:%02d.%03d", h, m, s,
+		 ms );
+#endif
+	ds = MSECS_PER_DAY;		// make this invalid
+	return FALSE;
+    }
+    ds = (h*SECS_PER_HOUR + m*SECS_PER_MIN + s)*1000 + ms;
+    return TRUE;
+}
+
+/*!
+  Returns a QTime object containing a time \a nsecs seconds later than
+  the time of this object (or earlier if \a ms is negative).
+
+  Note that the time will wrap if it passes midnight.
+
+  Example:
+  \code
+    QTime n( 14, 0, 0 );                // n == 14:00:00
+    QTime t;
+    t = n.addSecs( 70 );                // t == 14:01:10
+    t = n.addSecs( -70 );               // t == 13:58:50
+    t = n.addSecs( 10*60*60 + 5 );      // t == 00:00:05
+    t = n.addSecs( -15*60*60 );         // t == 23:00:00
+  \endcode
+
+  \sa addMSecs(), secsTo(), QDateTime::addSecs()
+*/
+
+QTime QTime::addSecs( int nsecs ) const
+{
+    return addMSecs(nsecs*1000);
+}
+
+/*!
+  Returns the number of seconds from this time to \a t (which is
+  negative if \a t is earlier than this time).
+
+  Since QTime measures time within a day and there are 86400 seconds
+  in a day, the result is between -86400 and 86400.
+
+  \sa addSecs() QDateTime::secsTo()
+*/
+
+int QTime::secsTo( const QTime &t ) const
+{
+    return ((int)t.ds - (int)ds)/1000;
+}
+
+/*!
+  Returns a QTime object containing a time \a ms milliseconds later than
+  the time of this object (or earlier if \a ms is negative).
+
+  Note that the time will wrap if it passes midnight. See addSecs()
+  for an example.
+
+  \sa addSecs(), msecsTo()
+*/
+
+QTime QTime::addMSecs( int ms ) const
+{
+    QTime t;
+    if ( ms < 0 ) {
+	// % not well-defined for -ve, but / is.
+	int negdays = (MSECS_PER_DAY-ms) / MSECS_PER_DAY;
+	t.ds = ((int)ds + ms + negdays*MSECS_PER_DAY)
+		% MSECS_PER_DAY;
+    } else {
+	t.ds = ((int)ds + ms) % MSECS_PER_DAY;
+    }
+    return t;
+}
+
+/*!
+  Returns the number of milliseconds from this time to \a t (which is
+  negative if \a t is earlier than this time).
+
+  Since QTime measures time within a day and there are 86400000
+  milliseconds in a day, the result is between -86400000 and 86400000.
+
+  \sa secsTo()
+*/
+
+int QTime::msecsTo( const QTime &t ) const
+{
+    return (int)t.ds - (int)ds;
+}
+
+
+/*!
+  \fn bool QTime::operator==( const QTime &t ) const
+
+  Returns TRUE if this time is equal to \a t, or FALSE if they are
+  different.
+*/
+
+/*!
+  \fn bool QTime::operator!=( const QTime &t ) const
+
+  Returns TRUE if this time is different from \a t, or FALSE if they
+  are equal.
+*/
+
+/*!
+  \fn bool QTime::operator<( const QTime &t ) const
+
+  Returns TRUE if this time is earlier than \a t, otherwise FALSE.
+*/
+
+/*!
+  \fn bool QTime::operator<=( const QTime &t ) const
+
+  Returns TRUE if this time is earlier than or equal to \a t,
+  otherwise FALSE.
+*/
+
+/*!
+  \fn bool QTime::operator>( const QTime &t ) const
+
+  Returns TRUE if this time is later than \a t, otherwise FALSE.
+*/
+
+/*!
+  \fn bool QTime::operator>=( const QTime &t ) const
+
+  Returns TRUE if this time is later than or equal to \a t, otherwise
+  FALSE.
+*/
+
+
+
+/*!
+  Returns the current time, as reported by the system clock.
+
+  Note that the accuracy depends on the accuracy of the underlying
+  operating system; not all systems provide 1-millisecond accuracy.
+*/
+
+QTime QTime::currentTime()
+{
+    QTime ct;
+    currentTime( &ct );
+    return ct;
+}
+
+/*!
+  \internal
+
+  Fetches the current time and returns TRUE if the time is within one
+  minute after midnight, otherwise FALSE. The return value is used by
+  QDateTime::currentDateTime() to ensure that the date there is correct.
+*/
+
+bool QTime::currentTime( QTime *ct )
+{
+    if ( !ct ) {
+#if defined(CHECK_NULL)
+	qWarning( "QTime::currentTime(QTime *): Null pointer not allowed" );
+#endif
+	return FALSE;
+    }
+
+#if defined(_OS_WIN32_)
+
+    SYSTEMTIME t;
+    GetLocalTime( &t );
+    ct->ds = MSECS_PER_HOUR*t.wHour + MSECS_PER_MIN*t.wMinute +
+	     1000*t.wSecond + t.wMilliseconds;
+    return (t.wHour == 0 && t.wMinute == 0);
+
+#elif defined(_OS_OS2_)
+
+    DATETIME t;
+    DosGetDateTime( &t );
+    ct->ds = MSECS_PER_HOUR*t.hours + MSECS_PER_MIN*t.minutes +
+	     1000*t.seconds + 10*t.hundredths;
+    return (t.hours == 0 && t.minutes == 0);
+
+#elif defined(_OS_MSDOS_)
+
+    _dostime_t t;
+    _dos_gettime( &t );
+    ct->ds = MSECS_PER_HOUR*t.hour + MSECS_PER_MIN*t.minute +
+	     t.second*1000 + t.hsecond*10;
+    return (t.hour== 0 && t.minute == 0);
+
+#elif defined(_OS_UNIX_)
+
+    struct timeval tv;
+    gettimeofday( &tv, 0 );
+    time_t ltime = tv.tv_sec;
+    tm *t = localtime( &ltime );
+    ct->ds = (uint)( MSECS_PER_HOUR*t->tm_hour + MSECS_PER_MIN*t->tm_min +
+		     1000*t->tm_sec + tv.tv_usec/1000 );
+    return (t->tm_hour== 0 && t->tm_min == 0);
+
+#else
+
+    time_t ltime;			// no millisecond resolution!!
+    ::time( &ltime );
+    tm *t = localtime( &ltime );
+    ct->ds = MSECS_PER_HOUR*t->tm_hour + MSECS_PER_MIN*t->tm_min +
+	     1000*t->tm_sec;
+    return (t->tm_hour== 0 && t->tm_min == 0);
+#endif
+}
+
+/*!
+  Returns TRUE if the specified time is valid, otherwise FALSE.
+
+  The time is valid if \a h is in the range 0-23, \a m and \a s are in
+  the range 0-59, and \a ms is in the range 0-999.
+
+  Example:
+  \code
+    QTime::isValid(21, 10, 30);		// returns TRUE
+    QTime::isValid(22, 5,  62);		// returns FALSE
+  \endcode
+*/
+
+bool QTime::isValid( int h, int m, int s, int ms )
+{
+    return (uint)h < 24 && (uint)m < 60 && (uint)s < 60 && (uint)ms < 1000;
+}
+
+
+/*!
+  Sets this time to the current time. This is practical for timing:
+
+  \code
+    QTime t;
+    t.start();				// start clock
+    ... // some lengthy task
+    qDebug( "%d\n", t.elapsed() );	// prints # msecs elapsed
+  \endcode
+
+  \sa restart(), elapsed(), currentTime()
+*/
+
+void QTime::start()
+{
+    *this = currentTime();
+}
+
+/*!
+  Sets this time to the current time, and returns the number of
+  milliseconds that have elapsed since the last time start() or
+  restart() was called.
+
+  This function is guaranteed to be atomic, and is thus very handy for
+  repeated measurements: call start() to start the first measurement,
+  then restart() for each later measurement.
+
+  Note that the counter wraps to zero 24 hours after the last call to
+  start() or restart().
+
+  \warning 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 e.g. when daylight saving is turned on or off.
+
+  \sa start(), elapsed(), currentTime()
+*/
+
+int QTime::restart()
+{
+    QTime t = currentTime();
+    int n = msecsTo( t );
+    if ( n < 0 )				// passed midnight
+	n += 86400*1000;
+    *this = t;
+    return n;
+}
+
+/*!
+  Returns the number of milliseconds that have elapsed since the last
+  time start() or restart() was called.
+
+  Note that the counter wraps to zero 24 hours after the last call to
+  start() or restart.
+
+  Note that the accuracy depends on the accuracy of the underlying
+  operating system; not all systems provide 1-millisecond accuracy.
+
+  \warning 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 e.g. when daylight saving is turned on or off.
+
+  \sa start(), restart()
+*/
+
+int QTime::elapsed()
+{
+    int n = msecsTo( currentTime() );
+    if ( n < 0 )				// passed midnight
+	n += 86400*1000;
+    return n;
+}
+
+
+/*****************************************************************************
+  QDateTime member functions
+ *****************************************************************************/
+
+/*!
+  \class QDateTime qdatetime.h
+  \brief The QDateTime class provides date and time functions.
+
+  \ingroup time
+
+  A QDateTime object contains a calendar date and a clock time (a
+  "datetime"). It is a combination of the QDate and QTime classes. It
+  can read the current datetime from the system clock. It provides
+  functions for comparing datetimes and for manipulating a datetime by
+  adding a number of seconds or days.
+
+  A QDateTime object is typically created either by giving a date and
+  time explicitly, or by using the static function currentTime(),
+  which makes a QDateTime object which contains the system's clock
+  time.
+
+  The date() and time() functions provide access to the date and time
+  parts of the datetime. The same information is provided in textual
+  format by the toString() function.
+
+  QDateTime provides a full set of operators to compare two QDateTime
+  objects. A datetime is considered smaller than another if it is
+  earlier than the other.
+
+  The datetime a given number of days or seconds later than a given
+  datetime can be found using the addDays() and addSecs()
+  functions. Correspondingly, the number of days or seconds between
+  two times can be found using the daysTo() or secsTo() functions.
+
+  A datetime can also be set using the setTime_t() function, which
+  takes a POSIX-standard "number of seconds since 00:00:00 on January
+  1, 1970" value.
+
+  The limitations regarding range and resolution mentioned in the
+  QDate and QTime documentation apply for QDateTime also.
+
+  \sa QDate, QTime
+*/
+
+
+/*!
+  \fn QDateTime::QDateTime()
+
+  Constructs a null datetime (i.e. null date and null time).  A null
+  datetime is invalid, since the date is invalid.
+
+  \sa isValid()
+*/
+
+
+/*!
+  Constructs a datetime with date \a date and null time (00:00:00.000).
+*/
+
+QDateTime::QDateTime( const QDate &date )
+    : d(date)
+{
+}
+
+/*!
+  Constructs a datetime with date \a date and time \a time.
+*/
+
+QDateTime::QDateTime( const QDate &date, const QTime &time )
+    : d(date), t(time)
+{
+}
+
+
+/*!
+  \fn bool QDateTime::isNull() const
+
+  Returns TRUE if both the date and the time are null.	A null date is invalid.
+
+  \sa QDate::isNull(), QTime::isNull()
+*/
+
+/*!
+  \fn bool QDateTime::isValid() const
+
+  Returns TRUE if both the date and the time are valid.
+
+  \sa QDate::isValid(), QTime::isValid()
+*/
+
+/*!
+  \fn QDate QDateTime::date() const
+
+  Returns the date part of this datetime.
+
+  \sa setDate(), time()
+*/
+
+/*!
+  \fn QTime QDateTime::time() const
+
+  Returns the time part of this datetime.
+
+  \sa setTime(), date()
+*/
+
+/*!
+  \fn void QDateTime::setDate( const QDate &date )
+
+  Sets the date part of this datetime.
+
+  \sa date(), setTime()
+*/
+
+/*!
+  \fn void QDateTime::setTime( const QTime &time )
+
+  Sets the time part of this datetime.
+
+  \sa time(), setDate()
+*/
+
+
+/*!
+  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.
+
+  Note that Microsoft Windows supports only a limited range of values for
+  \a secsSince1Jan1970UTC.
+*/
+
+void QDateTime::setTime_t( uint secsSince1Jan1970UTC )
+{
+    time_t tmp = (time_t) secsSince1Jan1970UTC;
+    tm *tM = localtime( &tmp );
+    if ( !tM ) {
+	tM = gmtime( &tmp );
+	if ( !tM ) {
+	    d.jd = QDate::greg2jul( 1970, 1, 1 );
+	    t.ds = 0;
+	    return;
+	}
+    }
+    d.jd = QDate::greg2jul( tM->tm_year + 1900, tM->tm_mon + 1, tM->tm_mday );
+    t.ds = MSECS_PER_HOUR*tM->tm_hour + MSECS_PER_MIN*tM->tm_min +
+	    1000*tM->tm_sec;
+}
+
+
+/*!
+  Returns the datetime as a string.
+
+  The string format is "Sat May 20 03:40:13 1998".
+
+  This function uses QDate::dayName(), QDate::monthName(), and
+  QTime::toString() to generate the string.
+
+*/
+
+QString QDateTime::toString() const
+{
+    QString buf = d.dayName(d.dayOfWeek());
+    buf += ' ';
+    buf += d.monthName(d.month());
+    buf += ' ';
+    buf += QString().setNum(d.day());
+    buf += ' ';
+    buf += t.toString();
+    buf += ' ';
+    buf += QString().setNum(d.year());
+    return buf;
+}
+
+/*!
+  Returns a QDateTime object containing a datetime \a ndays days later
+  than the datetime of this object (or earlier if \a ndays is
+  negative).
+
+  \sa daysTo(), addSecs()
+*/
+
+QDateTime QDateTime::addDays( int ndays ) const
+{
+    return QDateTime( d.addDays(ndays), t );
+}
+
+/*!
+  Returns a QDateTime object containing a datetime \a nsecs seconds
+  later than the datetime of this object (or earlier if \a nsecs is
+  negative).
+
+  \sa secsTo(), addDays()
+*/
+
+QDateTime QDateTime::addSecs( int nsecs ) const
+{
+    uint dd = d.jd;
+    int  tt = t.ds;
+    int  sign = 1;
+    if ( nsecs < 0 ) {
+	nsecs = -nsecs;
+	sign = -1;
+    }
+    if ( nsecs >= (int)SECS_PER_DAY ) {
+	dd += sign*(nsecs/SECS_PER_DAY);
+	nsecs %= SECS_PER_DAY;
+    }
+    tt += sign*nsecs*1000;
+    if ( tt < 0 ) {
+	tt = MSECS_PER_DAY - tt - 1;
+	dd -= tt / MSECS_PER_DAY;
+	tt = tt % MSECS_PER_DAY;
+	tt = MSECS_PER_DAY - tt - 1;
+    } else if ( tt >= (int)MSECS_PER_DAY ) {
+	dd += ( tt / MSECS_PER_DAY );
+	tt = tt % MSECS_PER_DAY;
+    }
+    QDateTime ret;
+    ret.t.ds = tt;
+    ret.d.jd = dd;
+    return ret;
+}
+
+/*!
+  Returns the number of days from this datetime to \a dt (which is
+  negative if \a dt is earlier than this datetime).
+
+  \sa addDays(), secsTo()
+*/
+
+int QDateTime::daysTo( const QDateTime &dt ) const
+{
+    return d.daysTo( dt.d );
+}
+
+/*!
+  Returns the number of seconds from this datetime to \a dt (which is
+  negative if \a dt is earlier than this datetime).
+
+  Example:
+  \code
+    QDateTime dt = QDateTime::currentDateTime();
+    QDateTime x( QDate(dt.year(),12,24), QTime(17,00) );
+    qDebug( "There are %d seconds to Christmas", dt.secsTo(x) );
+  \endcode
+
+  \sa addSecs(), daysTo(), QTime::secsTo()
+*/
+
+int QDateTime::secsTo( const QDateTime &dt ) const
+{
+    return t.secsTo(dt.t) + d.daysTo(dt.d)*SECS_PER_DAY;
+}
+
+
+/*!
+  Returns TRUE if this datetime is equal to \a dt, or FALSE if
+  they are different.
+  \sa operator!=()
+*/
+
+bool QDateTime::operator==( const QDateTime &dt ) const
+{
+    return  t == dt.t && d == dt.d;
+}
+
+/*!
+  Returns TRUE if this datetime is different from \a dt, or FALSE if
+  they are equal.
+  \sa operator==()
+*/
+
+bool QDateTime::operator!=( const QDateTime &dt ) const
+{
+    return  t != dt.t || d != dt.d;
+}
+
+/*!
+  Returns TRUE if this datetime is earlier than \a dt, otherwise FALSE.
+*/
+
+bool QDateTime::operator<( const QDateTime &dt ) const
+{
+    if ( d < dt.d )
+	return TRUE;
+    return d == dt.d ? t < dt.t : FALSE;
+}
+
+/*!
+  Returns TRUE if this datetime is earlier than or equal to \a dt,
+  otherwise FALSE.
+*/
+
+bool QDateTime::operator<=( const QDateTime &dt ) const
+{
+    if ( d < dt.d )
+	return TRUE;
+    return d == dt.d ? t <= dt.t : FALSE;
+}
+
+/*!
+  Returns TRUE if this datetime is later than \a dt, otherwise FALSE.
+*/
+
+bool QDateTime::operator>( const QDateTime &dt ) const
+{
+    if ( d > dt.d )
+	return TRUE;
+    return d == dt.d ? t > dt.t : FALSE;
+}
+
+/*!
+  Returns TRUE if this datetime is later than or equal to \a dt,
+  otherwise FALSE.
+*/
+
+bool QDateTime::operator>=( const QDateTime &dt ) const
+{
+    if ( d > dt.d )
+	return TRUE;
+    return d == dt.d ? t >= dt.t : FALSE;
+}
+
+/*!
+  Returns the current datetime, as reported by the system clock.
+
+  \sa QDate::currentDate(), QTime::currentTime()
+*/
+
+QDateTime QDateTime::currentDateTime()
+{
+    QDate cd = QDate::currentDate();
+    QTime ct;
+    if ( QTime::currentTime(&ct) )		// too close to midnight?
+	cd = QDate::currentDate();		// YES! time for some midnight
+						// voodoo, fetch date again
+    return QDateTime( cd, ct );
+}
+
+
+/*****************************************************************************
+  Date/time stream functions
+ *****************************************************************************/
+
+#ifndef QT_NO_DATASTREAM
+/*!
+  \relates QDate
+  Writes the date to the stream.
+
+  \sa \link datastreamformat.html Format of the QDataStream operators \endlink
+*/
+
+QDataStream &operator<<( QDataStream &s, const QDate &d )
+{
+    return s << (Q_UINT32)(d.jd);
+}
+
+/*!
+  \relates QDate
+  Reads a date from the stream.
+
+  \sa \link datastreamformat.html Format of the QDataStream operators \endlink
+*/
+
+QDataStream &operator>>( QDataStream &s, QDate &d )
+{
+    Q_UINT32 jd;
+    s >> jd;
+    d.jd = jd;
+    return s;
+}
+
+/*!
+  \relates QTime
+  Writes a time to the stream.
+
+  \sa \link datastreamformat.html Format of the QDataStream operators \endlink
+*/
+
+QDataStream &operator<<( QDataStream &s, const QTime &t )
+{
+    return s << (Q_UINT32)(t.ds);
+}
+
+/*!
+  \relates QTime
+  Reads a time from the stream.
+
+  \sa \link datastreamformat.html Format of the QDataStream operators \endlink
+*/
+
+QDataStream &operator>>( QDataStream &s, QTime &t )
+{
+    Q_UINT32 ds;
+    s >> ds;
+    t.ds = ds;
+    return s;
+}
+
+/*!
+  \relates QDateTime
+  Writes a datetime to the stream.
+
+  \sa \link datastreamformat.html Format of the QDataStream operators \endlink
+*/
+
+QDataStream &operator<<( QDataStream &s, const QDateTime &dt )
+{
+    return s << dt.d << dt.t;
+}
+
+/*!
+  \relates QDateTime
+  Reads a datetime from the stream.
+
+  \sa \link datastreamformat.html Format of the QDataStream operators \endlink
+*/
+
+QDataStream &operator>>( QDataStream &s, QDateTime &dt )
+{
+    s >> dt.d >> dt.t;
+    return s;
+}
+#endif //QT_NO_DATASTREAM