USAGE
   signed int sccdsdiff(
           signed long *diff,
           signed char *date1,
           signed int format1,
           signed char *date2,
           signed int format2 );

PROTOTYPE IN
   sc_clock.h

DESCRIPTION
   sccdsdiff returns the difference in days between date1 and date2.
   The two ASCIIZ date strings can be in any order, but the styles
   (format1, format2) must be valid.

   Date string styles:
   SC_GREGOR     mm/dd/yy
   SC_GREGORL    mm/dd/yyyy
   SC_JULIAN     yyyy/ddd
   SC_YMD        yyyymmdd
   SC_DMY        ddmmyy

EXAMPLE
   #include <stdio.h>
   #include <softc.h>
   #include <sc_clock.h>

   void main()
   {
     signed long d;

     sccdsdiff(&d, "19890213", SC_YMD,"19881217", SC_YMD);
     printf("%ld",d);
   }