qwt_date.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef _QWT_DATE_H_
#define _QWT_DATE_H_

#include "qwt_global.h"
#include <qdatetime.h>

class QWT_EXPORT QwtDate
{
public:
    enum Week0Type
    {
        FirstThursday,

        FirstDay
    };

    enum IntervalType
    {
        Millisecond,

        Second,

        Minute,

        Hour,

        Day,

        Week,

        Month,

        Year
    };

    enum
    {
        JulianDayForEpoch = 2440588
    };

    static QDate minDate();
    static QDate maxDate();

    static QDateTime toDateTime( double value, 
        Qt::TimeSpec = Qt::UTC );

    static double toDouble( const QDateTime & );

    static QDateTime ceil( const QDateTime &, IntervalType );
    static QDateTime floor( const QDateTime &, IntervalType );

    static QDate dateOfWeek0( int year, Week0Type );
    static int weekNumber( const QDate &, Week0Type );

    static int utcOffset( const QDateTime & );

    static QString toString( const QDateTime &, 
        const QString & format, Week0Type );
};

#endif