George White,
  In a message on 22 June, to Frank Adam, wrote :

GW> I doubt it :-(. Certainly Borland in BC 3.1 define clock() as returning
GW> ticks since the program start, Watcom is the same. It's a program
GW> execution timer, and theoretically measures program CPU usage, so I
GW> suspect it has it's heritage in the code to measure CPU usage in
GW> multiuser systems to charge users (Cs *NIX heritage showing through...).
GW> So unless the program is run continuously for more than 30 days it won't
GW> work.

You're right.

NAME
       clock - Determine processor time

SYNOPSIS
       #include 

       clock_t clock(void);

DESCRIPTION
       The clock() function returns an approximation of processor
       time used by the program.

RETURN VALUE
       The value returned is the  CPU  time  used  so  far  as  a
       clock_t;  to  get  the  number  of seconds used, divide by
       CLOCKS_PER_SEC.

CONFORMING TO
       ANSI C
  
...
               
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