Predefined Functions

[Ralph]

I want to know time related predefined functions present in programming language C and I also want to know the associated header file which must be included while using these predefined functions?

[sammy]

You have the following time related predefined functions in C programming language.
asctime
clock
ctime
difftime
gmtime
localtime
mktime
strftime
time

All these are available in the header file time.h in C .