How should the TIME function of the C language?

Head file Time.h @Function Name: LocalTime Function prototype: struct tm * localtime (const time_t * Timer) Function function: Returns a machine time information expressed in TM structure Function returns: the structure of the expression time tm, tm structure is defined as follows: Parameters: timer- using machine time time () function obtained ========================================== @ Function name: asctime Function prototype: char * asctime (struct tm * ptr) Function: to give the machine time (date and time is converted to ASCII code) The function returns: returns the string format for the time: weeks, months, days, hours: minutes: seconds, years Parameters: ptr be structured pointer function by localtime () and gmtime, () to give Belongs file: ======================================= @ Function name: ctime Function prototype: char * ctime (long time) Function: get calendar time The function returns: returns the string format: weeks, months, days, hours: minutes: seconds, years Parameters: time- time function parameter should be obtained Belongs file: ======================================== @ Function name: difftime Function prototype: double difftime (time_t time2, time_t time1) Function: the time difference to get the two machines, seconds Function returns: the time difference, seconds Parameters:. Time1- a time machine, time2- time two machines should use the time function of the parameter obtained Belongs file: ==================================== @ Function name: gmtime Function prototype: struct tm * gmtime (time_t * time) Function: to get the time information represented by the structure tm Function returns: time information pointer structure represented by tm Parameters: time time- function with time () information obtained Belongs file: ===================================== @ Function name: time Function prototype: time_t time (time_t * timer) Function: get or set the machine calendar time calendar time The function returns: machine calendar time Parameters: timer = NULL to give the machine calendar time, when the timer = time value, for setting the calendar time, is a long type time_t Belongs file: ===================================== @ Function name: tzset Function prototype: void tzset (void) Functions Function: UNIX-compatible functions for obtaining time zone, in a DOS environment without the use of Belongs file:, Read more

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