SNAP Library 2.2, User Reference  2014-03-11 19:15:55
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Static Public Member Functions | Static Public Attributes
TJulianDate Class Reference

#include <tm.h>

List of all members.

Static Public Member Functions

static int GetJulianDateN (int d, int m, int y)
static void GetCalendarDate (int jdn, int &dd, int &mm, int &yy)

Static Public Attributes

static int LastJulianDate = 15821004
static int LastJulianDateN = 2299160

Detailed Description

Definition at line 69 of file tm.h.

Member Function Documentation

void TJulianDate::GetCalendarDate ( int  jdn,
int &  dd,
int &  mm,
int &  yy 
) [static]

Definition at line 327 of file tm.cpp.

                                                                   {
  int julian = -1;

  long x, z, m, d, y;
  long daysPer400Years = 146097L;
  long fudgedDaysPer4000Years = 1460970L + 31;

  if (julian < 0){ /* set Julian flag if auto set */
    julian = (jdn <= LastJulianDateN);}

  x = jdn + 68569L;
  if (julian){
    x+=38;
    daysPer400Years = 146100L;
    fudgedDaysPer4000Years = 1461000L + 1;
  }
  z = 4 * x / daysPer400Years;
  x = x - (daysPer400Years * z + 3) / 4;
  y = 4000 * (x + 1) / fudgedDaysPer4000Years;
  x = x - 1461 * y / 4 + 31;
  m = 80 * x / 2447;
  d = x - 2447 * m / 80;
  x = m / 11;
  m = m + 2 - 12 * x;
  y = 100 * (z - 49) + y + x;

  yy = (int)y;
  mm = (int)m;
  dd = (int)d;

  if (yy <= 0){ /* adjust BC years */
   (yy)--;}
}
int TJulianDate::GetJulianDateN ( int  d,
int  m,
int  y 
) [static]

Definition at line 303 of file tm.cpp.

                                                  {
  IAssert(y != 0);
  int julian = -1;
  long jdn;

  if (julian < 0){ /* set Julian flag if auto set */
    julian = (((y * 100L) + m) * 100 + d  <=  LastJulianDate);}

  if (y < 0){ /* adjust BC year */
    y++;}

  if (julian){
    jdn = 367L * y - 7 * (y + 5001L + (m - 9) / 7) / 4
     + 275 * m / 9 + d + 1729777L;
  } else {
    jdn = (long)(d - 32076)
     + 1461L * (y + 4800L + (m - 14) / 12) / 4
     + 367 * (m - 2 - (m - 14) / 12 * 12) / 12
     - 3 * ((y + 4900L + (m - 14) / 12) / 100) / 4
     + 1;            /* correction by rdg */
  }
  return (int) jdn;
}

Member Data Documentation

int TJulianDate::LastJulianDate = 15821004 [static]

Definition at line 71 of file tm.h.

int TJulianDate::LastJulianDateN = 2299160 [static]

Definition at line 72 of file tm.h.

The documentation for this class was generated from the following files: