Java Utililty Methods Julian Date

List of utility methods to do Julian Date

  1. HOME
  2. Java
  3. J
  4. Julian Date

Description

The list of methods to do Julian Date are organized into topic(s).

Method

intjulian(int date)
julian 
int offset = date - MIN_GENERATE_DATE;
int result = MIN_GENERATE_DATE;
while (true) {
    int year = result / 1000;
    int yearEnd = year * 1000 + 365 + (isLeapYear(year) ? 1 : 0);
    if (result + offset <= yearEnd) {
        break;
    offset -= yearEnd - result + 1;
    result += 1000;
return (result + offset);
doublejulianCentury(double JD)
Julian century from the epoch. 
return (JD - 2451545.0) / 36525;
doublejulianCentury(double julianDay)
julian Century 
return ((julianDay - 2451545.0) / 36525.0);
intjulianDate2JDN(int year, int month, int day)
Converts a Julian date into a Julian day number 
int a = (14 - month) / 12;
int y = year + 4800 - a;
int m = month + (12 * a) - 3;
return day + ((153 * m + 2) / 5) + 365 * y + y / 4 - 32083;
doublejulianDay(int day, int month, int year)
julian Day 
int a = 0;
int b = 0;
boolean isGregorian = false;
if (year > GRGORIAN_BEGIN_YEAR) {
    isGregorian = true;
} else if (year == GRGORIAN_BEGIN_YEAR) {
    if (month > GRGORIAN_BEGIN_MONTH) {
        isGregorian = true;
...
intjulianDay(int YY, int MM, int DD)
calculation of julianDay based on http://www.imcce.fr/en/grandpublic/temps/jour_julien.php This is slightly slower because of a cusp at 1582, but is accurate before these times. 
int GGG = 1;
if (YY < 1582)
    GGG = 0;
if (YY <= 1582 && MM < 10)
    GGG = 0;
if (YY <= 1582 && MM == 10 && DD < 5)
    GGG = 0;
int JD = -1 * (7 * (((MM + 9) / 12) + YY) / 4);
...
longJulianDaysToUnix(double jd)
Julian Days To Unix 
return (long) ((jd - 2440587.5) * 86400.0);
voidjulianToString(StringBuilder buf, int julian)
julian To String 
int j = julian + 32044;
int g = j / 146097;
int dg = j % 146097;
int c = (dg / 36524 + 1) * 3 / 4;
int dc = dg - c * 36524;
int b = dc / 1461;
int db = dc % 1461;
int a = (db / 365 + 1) * 3 / 4;
...