struct tm

struct tm {
               int tm_sec;         /* seconds */
               int tm_min;         /* minutes */
               int tm_hour;        /* hours */
               int tm_mday;        /* day of the month , in the range 1 to 31*/
               int tm_mon;         /* month，in the range 0 to 11 */
               int tm_year;        /* year since 1900 */
               int tm_wday;        /* day of the week， in the range 0 to 6*/
               int tm_yday;        /* day in the year , in the range 0 to 365*/
               int tm_isdst;       /* daylight saving time */
           };
常用方发：

time_t t = time(NULL);
struct tm *tt = localtime(&t);

time(NULL)函数获取从1970-1-1 0:00到现在所经历的秒数，可以time(&t),而不获取返回值

localtime(&t)函数将该时间按转化为本地时间，存放在struct tm结构体中，返回该结构体的指针。

通过返回的指针来获取相应的时间项~