Function            dayofyear - calculate the day of the year

  Syntax              int dayofyear(struct ddate *d);

  Prototype in        datehk.h

  Remarks             dayofyear calculate the day of the year given a
                      date. The day of the year will range from 1
                      (January 1) to 365 (Dec 31, no leap year) or 366
                      (Dec 31, leap year.)

                      dayofyear does no error checking on passed
                      parameters.

  Return value        returns a number from 1 to 365 (no leap year) or
                      366 (leap year.)

  See also            dayofweek(), daysleft(), diffddate()

  Example             #include <datehk.h>

                      main()
                      {
                           struct ddate today;

                           /* set today to Feb 3, 1987 */
                           printf("%d/%d = day %d\n", today.dmon,
                                today.dday, dayofyear(&today));
                      }

  Program output      2/3 = day 34