Time.h

'Time.h' header file defines several functions to work on time manipulation and conversion.

Function Name	Return	What They Do
clock	number of clock ticks elapsed since the program start	Clock program
difftime	difference in seconds(time2-time1) as a floating point double	Return difference between two times
mktime	time_t value corresponding to calender time passed as argument	Convert tm structure to time_t
Time	current calender time as time_t object	Get current time

Function Name	Return	What They Do
asctime	C string containing date and time information in a human readable format	Convert tm structure to string
ctime	C string containing date and time information in a human readable format	Convert time_t value to string
gmtime	pointer to a tm structure with time information filled in	Convert time_t to tm as UTC time
localtime	pointer to a structure with the time information filled in	Convert time_t to tm as local time
strftime	number of characters copied to pointer (not including the terminating null-character) is returned	Format time to string