What is the precise definition of JDE's Julian Date format?

Question

I am writing code to convert from a Gregorian date to a JDE (J.D.Edwards) Julian date.

Note: a JDE Julian date is different from the normal usag

Answer 1

I have an easy way for C using time now and epoch 1970, 01, 01 midnight if anybody is interested. But this is for Julian Day Numbers which is not the same as JDE but they are similar in respect to using math to compute days and I'm sure this idea could be adapted for JDE. Sometimes people just confuse the two like I do. Sorry. But still this is an example of using a time reference which should always be done and since most computers use this it would be just as easy for us not to get too bogged down in dates and just use days before or after this epoch.

Since JDE is now owned by Oracle, they also now support Julian_Day. see: https://docs.oracle.com/javase/8/docs/api/java/time/temporal/JulianFields.html

#include 
#include 
#define EPOCH (double)  2440587.5 /* Julian Day number for Jan. 01, 1970 midnight */
int main ()
{
 double days = time(0)/86400.0;

 printf ("%f days since January 1, 1970\n", days);

 printf ("%f\n", days + EPOCH);

 return 0;  
}