Converts a binary timestamp to three binary timestamps that
    represent the earliest, most likely, and latest time.

    Format

      #include <utc.h>

      int utc_pointtime(*utclp, *utcmp, *utchp, *utc)

         utc_t *utclp;
         utc_t *utcmp;
         utc_t *utchp;
         const utc_t *utc;