< c‎ | chrono
Defined in header <time.h>
typedef /* unspecified */ clock_t;

Arithmetic (until C11)Real (since C11) type capable of representing the processor time used by a process. It has implementation-defined range and precision.


  • C11 standard (ISO/IEC 9899:2011):
  • 7.27.1/3 Components of time (p: 388)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.23.1/3 Components of time (p: 338)
  • C89/C90 standard (ISO/IEC 9899:1990):
  • 4.12.1 Components of time

See also

returns raw processor clock time since the program is started
number of processor clock ticks per second
(macro constant)
C++ documentation for clock_t