kstarsdatetime.h

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/***************************************************************************
                          kstarsdatetime.h  -  K Desktop Planetarium
                             -------------------
    begin                : Tue 05 May 2004
    copyright            : (C) 2001 by Jason Harris
    email                : jharris@30doradus.org
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef KSTARSDATETIME_H_
#define KSTARSDATETIME_H_

#define J2000 2451545.0 //Julian Date for noon on Jan 1, 2000 (epoch J2000)
#define B1950 2433282.4235  // Julian date for Jan 0.9235, 1950
#define SIDEREALSECOND 1.002737909 //number of sidereal seconds in one solar second

#include <kdatetime.h>

class dms;

class KStarsDateTime : public KDateTime
{
public:
    KStarsDateTime();

    KStarsDateTime( long double djd );

    KStarsDateTime( const KStarsDateTime &kdt );

    KStarsDateTime( const KDateTime &kdt );

    KStarsDateTime( const QDateTime &qdt );

    KStarsDateTime( const QDate &_d, const QTime &_t );

    void setDJD( long double jd );

    void setDate( const QDate &d );

    void setTime( const QTime &t );

    KStarsDateTime addSecs( double s ) const;

    inline KStarsDateTime addDays( int nd ) const { return KStarsDateTime( djd() + (long double)nd ); }

    inline bool operator == ( const KStarsDateTime &d ) const { return DJD == d.djd(); }
    inline bool operator != ( const KStarsDateTime &d ) const { return DJD != d.djd(); }
    inline bool operator  < ( const KStarsDateTime &d ) const { return DJD  < d.djd(); }
    inline bool operator <= ( const KStarsDateTime &d ) const { return DJD <= d.djd(); }
    inline bool operator  > ( const KStarsDateTime &d ) const { return DJD  > d.djd(); }
    inline bool operator >= ( const KStarsDateTime &d ) const { return DJD >= d.djd(); }

    static KStarsDateTime currentDateTime(KDateTime::Spec ts = KDateTime::Spec::ClockTime());

    static KStarsDateTime fromString( const QString &s );

    inline long double djd() const { return DJD; }

    dms gst() const;

    QTime GSTtoUT( dms GST ) const;


    inline double epoch() const { return ( double( date().year() )
                                        + double( date().dayOfYear() )/double( date().daysInYear() ) ); }

    bool setFromEpoch( double e );

    bool setFromEpoch( const QString &e );


private:
    dms GSTat0hUT() const;

    long double DJD;
};

#endif  //KSTARSDATETIME_H_