Time function in c++

To find the time difference in executing a part of program is done by using functions from (time.h)

it has got mainly two type of time 

1). Calander Time

2) System  Clock time :  It is represented by clock_t() and Clock().

The calender time has a time structure:
This structure contains different type of time data types.
Details of the structure is
struct tm{
              int tm_sec;                /// time in seconds
              int tm_min;              /// time in minute

              int tm_hour;           ///   time in hour

              int tm_mday;            // month day (1-31)

              int tm_mon;             ///month (1-12)

              int tm_wday;          /// days of week;

              int tm_yday;          ///days of year(0-365)

              int tm_year;         ///year 

              int tm_isdst;        ///Daylight Saving Time enabled (> 0), disabled (= 0), or unknown (< 0)

             }