int eraD2dtf	(	const char *	scale,
		int	ndp,
		double	d1,
		double	d2,
		int *	iy,
		int *	im,
		int *	id,
		int	ihmsf[4]
	)

Definition at line 4 of file d2dtf.c.

References eraD2tf(), eraDat(), eraJd2cal(), ERFA_DAYSEC, and i.

Referenced by t_d2dtf().

{
   int leap;
   char s;
   int iy1, im1, id1, js, iy2, im2, id2, ihmsf1[4], i;
   double a1, b1, fd, dat0, dat12, w, dat24, dleap;

/* The two-part JD. */
   a1 = d1;
   b1 = d2;

/* Provisional calendar date. */
   js = eraJd2cal(a1, b1, &iy1, &im1, &id1, &fd);
   if ( js ) return -1;

/* Is this a leap second day? */
   leap = 0;
   if ( ! strcmp(scale,"UTC") ) {

   /* TAI-UTC at 0h today. */
      js = eraDat(iy1, im1, id1, 0.0, &dat0);
      if ( js < 0 ) return -1;

   /* TAI-UTC at 12h today (to detect drift). */
      js = eraDat(iy1, im1, id1, 0.5, &dat12);
      if ( js < 0 ) return -1;

   /* TAI-UTC at 0h tomorrow (to detect jumps). */
      js = eraJd2cal(a1+1.5, b1-fd, &iy2, &im2, &id2, &w);
      if ( js ) return -1;
      js = eraDat(iy2, im2, id2, 0.0, &dat24);
      if ( js < 0 ) return -1;

   /* Any sudden change in TAI-UTC (seconds). */
      dleap = dat24 - (2.0*dat12 - dat0);

   /* If leap second day, scale the fraction of a day into SI. */
      leap = (dleap != 0.0);
      if (leap) fd += fd * dleap/ERFA_DAYSEC;
   }

/* Provisional time of day. */
   eraD2tf ( ndp, fd, &s, ihmsf1 );

/* Has the (rounded) time gone past 24h? */
   if ( ihmsf1[0] > 23 ) {

   /* Yes.  We probably need tomorrow's calendar date. */
      js = eraJd2cal(a1+1.5, b1-fd, &iy2, &im2, &id2, &w);
      if ( js ) return -1;

   /* Is today a leap second day? */
      if ( ! leap ) {

      /* No.  Use 0h tomorrow. */
         iy1 = iy2;
         im1 = im2;
         id1 = id2;
         ihmsf1[0] = 0;
         ihmsf1[1] = 0;
         ihmsf1[2] = 0;

      } else {

      /* Yes.  Are we past the leap second itself? */
         if ( ihmsf1[2] > 0 ) {

         /* Yes.  Use tomorrow but allow for the leap second. */
            iy1 = iy2;
            im1 = im2;
            id1 = id2;
            ihmsf1[0] = 0;
            ihmsf1[1] = 0;
            ihmsf1[2] = 0;

         } else {

         /* No.  Use 23 59 60... today. */
            ihmsf1[0] = 23;
            ihmsf1[1] = 59;
            ihmsf1[2] = 60;
         }

      /* If rounding to 10s or coarser always go up to new day. */
         if ( ndp < 0 && ihmsf1[2] == 60 ) {
            iy1 = iy2;
            im1 = im2;
            id1 = id2;
            ihmsf1[0] = 0;
            ihmsf1[1] = 0;
            ihmsf1[2] = 0;
         }
      }
   }

/* Results. */
   *iy = iy1;
   *im = im1;
   *id = id1;
   for ( i = 0; i < 4; i++ ) {
      ihmsf[i] = ihmsf1[i];
   }

/* Status. */
   return js;

}

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