/*
	date.h
	The BMS (DATE) type is the number of days since 12/31/69.
	The BMS (JULDAY) type is the number of days since ???? B.C.
*/

#ifndef MAXDATE
#include <time.h>
/* some routines using this expect yy to be 2 digits, and some expect 4  */
struct mmddyy {
  short mm;
  short dd;
  short yy;
  mmddyy() {}
  mmddyy(short m, short d, short y) : mm(m),dd(d),yy(y) {}
  mmddyy(long d);
  long encode() const {
    long yr = mm < 100 ? 10000L : 1000000L;
    return mm * yr + dd * 100L + yy;
  }
};

extern "C" {
  long stoJ(const char *);
  unsigned short stoD(const char *), sysD();
  long julian(const mmddyy *);
  void julmdy(long,mmddyy *);
  void decode(mmddyy *,long);
  void tm_mask(const struct tm *,const char *,char *);
  void timemask(time_t,const char *,char *);
}

class String;

String tm_mask(const struct tm *,const char *);

inline mmddyy::mmddyy(long d) { decode(this,d); }

class Date {
  unsigned short dayno;
public:
  Date() { dayno = sysD(); }		/* todays date */
  operator unsigned short() const { return dayno; }
  Date(unsigned short d) { dayno = d; }
  Date(const char *s) { dayno = stoD(s); }
  Date(const mmddyy &d);
  Date(short mm,short dd,short yy) { dayno = Date(mmddyy(mm,dd,yy)); }
  Date(long d) { dayno = Date(mmddyy(d)); }
  char *fmt(char *buf,int size) const;
  mmddyy mdy() const;
};

#define MAXDATE		Date((unsigned short)~0)

class Julday {
  long dayno;
public:
  Julday() { dayno = julian(0); }
  Julday(long d) { dayno = d; }
  Julday(Date d) { dayno = d ? d + 2415385L : 0; }
  operator Date() const {
    return (unsigned short)(dayno ? dayno - 2415385L : 0);
  }
  Julday(const mmddyy &d) { dayno = julian(&d); }
  Julday(short mm,short dd,short yy) { *this = Julday(mmddyy(mm,dd,yy)); }
  Julday(const char *s) { dayno = stoJ(s); }
  Julday operator+(int j) const { return dayno + j; }
  Julday operator-(int j) const { return dayno - j; }
  long operator-(const Julday &j) const { return dayno - j.dayno; }
  operator long() const { return dayno; }
  mmddyy mdy() const { mmddyy mdy; julmdy(dayno,&mdy); return mdy; }
  operator mmddyy() const { mmddyy mdy; julmdy(dayno,&mdy); return mdy; }
  void mdy(struct tm &) const;
  String pic(const char *mask) const;
};

#endif