C语言的时间函数

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下面是C语言的获取本地时间和构造时间进行格式化时间显示输出的相关函数：
This  page  is  part of release 3.35 of the Linux man-pages project.

#include <time.h>

char *asctime(const struct tm *tm);

       char *asctime_r(const struct tm *tm, char *buf);
char *ctime(const time_t *timep);

       char *ctime_r(const time_t *timep, char *buf);
struct tm *gmtime(const time_t *timep);

       struct tm *gmtime_r(const time_t *timep, struct tm *result);
struct tm *localtime(const time_t *timep);

       struct tm *localtime_r(const time_t *timep, struct tm *result);
time_t mktime(struct tm *tm);

Broken-down  time  is  stored  in  the structure tm which is defined in

       <time.h> as follows:
struct tm {

               int tm_sec;         /* seconds */

               int tm_min;         /* minutes */

               int tm_hour;        /* hours */

               int tm_mday;        /* day of the month */

               int tm_mon;         /* month */

               int tm_year;        /* year */

               int tm_wday;        /* day of the week */

               int tm_yday;        /* day in the year */

               int tm_isdst;       /* daylight saving time */

           };

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