date.h

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#ifndef DATE_H
#define DATE_H


/* Date.h -- declarations for Gregorian calendar dates

        THIS SOFTWARE FITS THE DESCRIPTION IN THE U.S. COPYRIGHT ACT OF A
        "UNITED STATES GOVERNMENT WORK".  IT WAS WRITTEN AS A PART OF THE
        AUTHOR'S OFFICIAL DUTIES AS A GOVERNMENT EMPLOYEE.  THIS MEANS IT
        CANNOT BE COPYRIGHTED.  THIS SOFTWARE IS FREELY AVAILABLE TO THE
        PUBLIC FOR USE WITHOUT A COPYRIGHT NOTICE, AND THERE ARE NO
        RESTRICTIONS ON ITS USE, NOW OR SUBSEQUENTLY.

Author:
        K. E. Gorlen
        Computer Systems Laboratory, DCRT
        National Institutes of Health
        Bethesda, MD 20892

log:    DATE.H $
Revision 1.2  95/01/29  13:27:02  NT_Test_Machine
*** empty log message ***

Revision 1.1  90/05/20  04:19:26  Anthony_Scian
.

 * Revision 3.0  90/05/20  00:19:24  kgorlen
 * Release for 1st edition.
 * 
*/

#include "Object.h"

#ifndef NESTED_TYPES
typedef unsigned short dayTy;
typedef unsigned short monthTy;
typedef unsigned short yearTy;
typedef unsigned long  julTy;
#endif

class Date: public VIRTUAL Object {
        DECLARE_MEMBERS(Date);
public:                 // type definitions
#ifdef NESTED_TYPES
        typedef unsigned short dayTy;
        typedef unsigned short monthTy;
        typedef unsigned short yearTy;
        typedef unsigned long  julTy;
#endif
public:                 // static member functions
        static dayTy dayOfWeek(const char* dayName);
        static bool dayWithinMonth(monthTy month, dayTy day, yearTy year);
        static dayTy daysInYear(yearTy year);
        static julTy jday(monthTy m, dayTy d, yearTy y);
        static bool leapYear(yearTy year);
        static const char* nameOfDay(dayTy weekDayNumber);
        static const char* nameOfMonth(monthTy monthNumber);
        static monthTy numberOfMonth(const char* monthName);
private:                // private member variables
        julTy julnum;   // Julian Day Number (Not same as Julian date.  Jan. 29, 1988 
                        // is not the same as 88029 in Julian Day Number.)
        Date(julTy j)                   { julnum = j; }
        julTy parseDate(istream&);
protected:              // storer() functions for object I/O
        virtual void storer(OIOofd&) const;
        virtual void storer(OIOout&) const;
public:
        Date();                         // current date 
        Date(long dayCount);
        Date(long dayCount, yearTy referenceYear);
        Date(dayTy newDay, const char* monthName, yearTy newYear);
        Date(istream&);                 // read date from stream 
        bool operator<(const Date& date) const  { return julnum < date.julnum; }
        bool operator<=(const Date& date) const { return julnum <= date.julnum; }
        bool operator>(const Date& date) const  { return date < *this; }
        bool operator>=(const Date& date) const { return date <= *this; }
        bool operator==(const Date& date) const { return julnum == date.julnum; }
        bool operator!=(const Date& date) const { return julnum != date.julnum; }
        friend Date operator+(const Date& dt, int dd)   { return Date(dt.julnum + dd); }
        friend Date operator+(int dd, const Date& dt)   { return Date(dt.julnum + dd); }
        int operator-(const Date& dt) const     { return (int)(julnum - dt.julnum); }
        Date operator-(int dd) const            { return Date(julnum - dd); }
        void operator+=(int dd)                 { julnum += dd; }
        void operator-=(int dd)                 { julnum -= dd; }
        bool between(const Date& d1, const Date& d2) const {
                return julnum >= d1.julnum && julnum <= d2.julnum;
        }
        dayTy day() const;
        dayTy dayOfMonth() const;
        dayTy firstDayOfMonth() const           { return firstDayOfMonth(month()); }
        dayTy firstDayOfMonth(monthTy month) const;
        bool leap() const;
        Date max(const Date& dt) const { 
                if (dt.julnum > julnum) return dt;
                else return *this;
        }
        void mdy(monthTy&,dayTy&,yearTy&) const;
        Date min(const Date& dt) const {
                if (dt.julnum < julnum) return dt;
                else return *this;
        }
        monthTy month() const;
        const char* nameOfMonth() const;
        Date previous(const char* dayName) const;
        dayTy weekDay() const;
        yearTy year() const;
        virtual int compare(const Object&) const;
        virtual void deepenShallowCopy();       // {}
        virtual unsigned hash() const;
        virtual bool isEqual(const Object&) const;
        virtual void printOn(ostream& strm =cout) const;
        virtual void scanFrom(istream& strm);
        virtual const Class* species() const;
};

#endif