Time Manipulation

clock Clock program (function )
difftime return difference between two times (function )
mktime Convert tm structure to time_t (function )
time Get current time (function )

Conversion

asctime Convert tm structure to string (function )
ctime Convert time_t value to string (function )
gmtime Convert time_t to tm as UTC time (function )
localtime Convert time_t to tm as local time (function )
strftime Format time as string (function )

Macro Constants

CLOCKS_PER_SECClock ticks per second (macro )
NULL Null pointer (macro )

Types

clock_t Clock type (type )
size_t Unsigned integral type (type )
time_t Time type (type )
struct tm Time structure (type )