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# qdatetime.h

This is the verbatim text of the qdatetime.h include file. It is provided only for illustration; the copyright remains with Trolltech.

    /****************************************************************************
    ** $Id: qt/src/tools/qdatetime.h   2.3.1   edited 2001-01-26 $
    **
    ** Definition 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.
    **
    **********************************************************************/

    #ifndef QDATETIME_H
    #define QDATETIME_H

    #ifndef QT_H
    #include "qstring.h"
    #endif // QT_H

    /*****************************************************************************
      QDate class
     *****************************************************************************/

    class Q_EXPORT QDate
    {
    public:
        QDate()  { jd=0; }                          // set null date
        QDate( int y, int m, int d );               // set date

        bool   isNull()      const { return jd == 0; }
        bool   isValid()     const;                 // valid date

        int    year()        const;                 // 1752..
        int    month()       const;                 // 1..12
        int    day()         const;                 // 1..31
        int    dayOfWeek()   const;                 // 1..7 (monday==1)
        int    dayOfYear()   const;                 // 1..365
        int    daysInMonth() const;                 // 28..31
        int    daysInYear()  const;                 // 365 or 366

        virtual QString monthName( int month ) const;
        virtual QString dayName( int weekday ) const;

        QString toString()   const;

        bool   setYMD( int y, int m, int d );

        QDate  addDays( int days )          const;
        int    daysTo( const QDate & )      const;

        bool   operator==( const QDate &d ) const { return jd == d.jd; }
        bool   operator!=( const QDate &d ) const { return jd != d.jd; }
        bool   operator<( const QDate &d )  const { return jd < d.jd; }
        bool   operator<=( const QDate &d ) const { return jd <= d.jd; }
        bool   operator>( const QDate &d )  const { return jd > d.jd; }
        bool   operator>=( const QDate &d ) const { return jd >= d.jd; }

        static QDate currentDate();
        static bool  isValid( int y, int m, int d );
        static bool  leapYear( int year );

    protected:
        static uint  greg2jul( int y, int m, int d );
        static void  jul2greg( uint jd, int &y, int &m, int &d );
    private:
        static const char * const monthNames[];
        static const char * const weekdayNames[];
        uint         jd;
        friend class QDateTime;
    #ifndef QT_NO_DATASTREAM
        friend Q_EXPORT QDataStream &operator<<( QDataStream &, const QDate & );
        friend Q_EXPORT QDataStream &operator>>( QDataStream &, QDate & );
    #endif
    };

    /*****************************************************************************
      QTime class
     *****************************************************************************/

    class Q_EXPORT QTime
    {
    public:
        QTime() { ds=0; }                           // set null time
        QTime( int h, int m, int s=0, int ms=0 );   // set time

        bool   isNull()      const { return ds == 0; }
        bool   isValid()     const;                 // valid time

        int    hour()        const;                 // 0..23
        int    minute()      const;                 // 0..59
        int    second()      const;                 // 0..59
        int    msec()        const;                 // 0..999

        QString toString()   const;

        bool   setHMS( int h, int m, int s, int ms=0 );

        QTime  addSecs( int secs )          const;
        int    secsTo( const QTime & )      const;
        QTime  addMSecs( int ms )           const;
        int    msecsTo( const QTime & )     const;

        bool   operator==( const QTime &d ) const { return ds == d.ds; }
        bool   operator!=( const QTime &d ) const { return ds != d.ds; }
        bool   operator<( const QTime &d )  const { return ds < d.ds; }
        bool   operator<=( const QTime &d ) const { return ds <= d.ds; }
        bool   operator>( const QTime &d )  const { return ds > d.ds; }
        bool   operator>=( const QTime &d ) const { return ds >= d.ds; }

        static QTime currentTime();
        static bool  isValid( int h, int m, int s, int ms=0 );

        void   start();
        int    restart();
        int    elapsed();

    private:
        static bool currentTime( QTime * );

        uint   ds;
        friend class QDateTime;
    #ifndef QT_NO_DATASTREAM
        friend Q_EXPORT QDataStream &operator<<( QDataStream &, const QTime & );
        friend Q_EXPORT QDataStream &operator>>( QDataStream &, QTime & );
    #endif
    };

    /*****************************************************************************
      QDateTime class
     *****************************************************************************/

    class Q_EXPORT QDateTime
    {
    public:
        QDateTime() {}                              // set null date and null time
        QDateTime( const QDate & );
        QDateTime( const QDate &, const QTime & );

        bool   isNull()     const           { return d.isNull() && t.isNull(); }
        bool   isValid()    const           { return d.isValid() && t.isValid(); }

        QDate  date()       const           { return d; }
        QTime  time()       const           { return t; }
        void   setDate( const QDate &date ) { d=date; }
        void   setTime( const QTime &time ) { t=time; }
        void   setTime_t( uint secsSince1Jan1970UTC );

        QString toString()  const;

        QDateTime addDays( int days )       const;
        QDateTime addSecs( int secs )       const;
        int    daysTo( const QDateTime & )  const;
        int    secsTo( const QDateTime & )  const;

        bool   operator==( const QDateTime &dt ) const;
        bool   operator!=( const QDateTime &dt ) const;
        bool   operator<( const QDateTime &dt )  const;
        bool   operator<=( const QDateTime &dt ) const;
        bool   operator>( const QDateTime &dt )  const;
        bool   operator>=( const QDateTime &dt ) const;

        static QDateTime currentDateTime();

    private:
        QDate  d;
        QTime  t;
    #ifndef QT_NO_DATASTREAM
        friend Q_EXPORT QDataStream &operator<<( QDataStream &, const QDateTime &);
        friend Q_EXPORT QDataStream &operator>>( QDataStream &, QDateTime & );
    #endif
    };

    /*****************************************************************************
      Date and time stream functions
     *****************************************************************************/

    #ifndef QT_NO_DATASTREAM
    Q_EXPORT QDataStream &operator<<( QDataStream &, const QDate & );
    Q_EXPORT QDataStream &operator>>( QDataStream &, QDate & );
    Q_EXPORT QDataStream &operator<<( QDataStream &, const QTime & );
    Q_EXPORT QDataStream &operator>>( QDataStream &, QTime & );
    Q_EXPORT QDataStream &operator<<( QDataStream &, const QDateTime & );
    Q_EXPORT QDataStream &operator>>( QDataStream &, QDateTime & );
    #endif // QT_NO_DATASTREAM

    #endif // QDATETIME_H