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julian routin conversion

 
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Alejandro Fernandez



Joined: 21 Feb 2005
Posts: 1

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julian routin conversion
PostPosted: Mon Feb 21, 2005 5:39 pm     Reply with quote
Does anybody know a place to seek a good julian-to-gregorian date convertion?
I wander if it is one to PIC.

Thanks in advance

Alejandro
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Mon Feb 21, 2005 6:36 pm     Reply with quote
You will have to test it

Code:

/* Function JulianToGregorian. Takes 4 arguments: Julian day number,  */
/* and dd, mm, and yyyy for a Gregorian date. Function calculates     */
/* Gregorian date corresponding to JDN and stores it in dd, mm, yyyy  */
/* Note: this function makes use of a widely-published algorithm.     */
/* Unfortunately, it seems to have been optimsed for efficiency       */
/* rather than for comprehensibility. There's a lesson here:          */
/*      if you don't need to understand something, don't.             */
void JulianToGregorian (int32 jd, int16 * dd, int16 * mm, int16 * yyyy)
{
int32 temp,
     i,
     n,
     j ;

temp = jd + 68569 ;
n = (4 * temp) / 146097 ;
temp = temp - (146097 * n + 3) / 4 ;
i = (4000 * (temp + 1)) / 1461001 ;
temp = temp - (1461 * i) / 4 + 31 ;
j = (80 * temp) / 2447 ;
*dd = temp - (2447 * j) / 80 ;
temp = j / 11 ;
*mm = j + 2 - (12 * temp) ;
*yyyy = 100 * (n - 49) + i + temp ;
}
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