/*****
                              datecmp()

      This function returns the number of days that have elapsed between
   two dates.  The number of days between Jan. 1 (1) and Nov. 11 (315)
   in a non-leap year is treated as 314. If you disagree, you can change
   this function accordingly.

   Argument list:    int d1         the day for year 1
                     int m1          "  month   "
                     int y1          "  year    "
                     int d1         the day for year 2
                     int m1          "  month   "
                     int y1          "  year    "

   Return value:     unsigned int   the number of days from date1 to date2

*****/

#include <stdlib.h>

unsigned int datecmp(int d1, int m1, int y1, int d2, int m2, int y2)
{
   int i, max, min, t1, t2, years = 0;

   t1 = julian(d1, m1, y1);
   t2 = julian(d2, m2, y2);

   if (y1 != y2) {                        /* Must go across years */
      if (y1 > y2) {
         max = y1;
         min = y2;
         t2 = julian(31, 12, y2) - t2;    /* Days to end of year  */
      } else {
         max = y2;
         min = y1;
         t1 = julian(31, 12, y2) - t1;
      }
      for (i = max; i > min + 1; i--) {   /* For all years        */
         years += 365 + leapyear(i);
      }
   } else {
     t1 = julian(d1, m1, y1);
     t2 = julian(d2, m2, y2);
     return (abs(t1 - t2));
   }
   return (t1 + t2 + years + 1);
}