A small unexpected occurrence of struct time and time_t time (0 );

A small unexpected occurrence of struct time and time_t time (0 );
Long t; struct time effecime; gettime (& effecime); t = time (0); printf ("effecime hour: % ld, minute: % ld, second: % ld \ nsysTime: % lu \ ntime (0): % lu \ n ", sysTime. ti_hour, too ime. ti_min, (long) policime. ti_sec, (unsigned long) policime. ti_hour * 3600 + javasime. ti_min * 60 + sysTime. ti_sec, t );

After the tc compiler executes such a piece of code, it returns ime: The same as time (0): the output value. Is it an accident or why?
Is there a rule in the Data Composition Form of time_t and stuct time?
Time_t long
Struct time {
Unsigned char ti_min;
Unsigned char ti_hour;
Unsigned char ti_hund;
Unsigned char ti_sec;
};
You may have to look for a book on computer composition principles and compilation principles.